Mathskey.com - Recent questions and answers in PRE-ALGEBRA

Answered: Which number is the additive inverse of -10 1/4

Fri, 25 Feb 2022 11:44:17 +0000

Added substance converse is likewise called something contrary to the number, invalidation of number or changed indication of unique number...

Answered: -2x+3y=-15 =3x+2y=-23 elimination

Mon, 08 Mar 2021 06:49:57 +0000

y=-7

x=-3

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y=(x-1)(x+7)

Tue, 13 Oct 2020 14:42:08 +0000

axis of symmetry

3x-8+5x=-2x-28

Wed, 07 Oct 2020 14:35:40 +0000

the one to one functions g and h are defined as follows. g={(4,0), (5,6),(6,5),(9,-7)}

Mon, 28 Oct 2019 05:41:29 +0000

find the cube root of 64

Mon, 19 Aug 2019 08:49:02 +0000

8 is to 23 as 27 is to ?

Tue, 18 Jun 2019 20:24:08 +0000

7x-y+z=-24, 3x+2y-3z=-3, x-3y+2z=-12

Sat, 08 Jun 2019 11:13:05 +0000

7x-y+z=-24, 3x+2y-3z=-3, x-3y+2z=-12 solve the system of equations

solve for 7x-y+z=-24, 3x+2y-3=-3, x-3y+2z=-12

Sat, 08 Jun 2019 11:06:55 +0000

Sketch the graph of each line

Sat, 30 Mar 2019 03:27:36 +0000

4x+5=5y

Much like diaries MLB 19 Stubs

Fri, 29 Mar 2019 12:11:48 +0000

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I want to see more abilities follow the model of my skill, Slayer, that is about monsters. Slayer makes training your combat skills more enjoyable by taking you around Runescape, also because it makes you fight a lot of different monsters, you receive item drops that fuel an assortment of noncombat skillsgems for Crafting, seeds for Farming, alloy bars for Smithing. I'd really like to find that kind of diversity come into skills like Herblore and Agility, and I want to see more abilities interact with other skills, like the way I trained while leveling Hunter Woodcutting. Efficiency is enjoyable, and Runescape is at its best when you're not stuck doing one thing.

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Does y= -5 fit into the inequality, 2x -3 > -14

Fri, 22 Mar 2019 11:38:14 +0000

the sum of the reciprocals of two numbers is 4. four times the product of their reciprocals is 15

Mon, 19 Nov 2018 16:22:22 +0000

Answered: 6x-3y=15, 7x+4y=10

Mon, 22 Oct 2018 01:37:51 +0000

The Simultaneous equations are

6x - 3y = 15 ----------------> (1)

7x + 4y = 10 -----------------> (2)

Multiply Eq (1) with "4" and Eq (2) with "3" and add them

Eq (1) X 4 ========> 24x - 12y = 60

Eq (2) X 3 ========> 21x + 12y = 30

-----------------------------------

45x = 90

x = 90/45

x = 2

Substitute x = 2 in Eq (2)

7(2) + 4y = 10

14 + 4y = 10

4y = 10 - 14

4y = -4

y = -4/4

y = -1

Answer :

The Solutions are x = 2 and y = -1.

Answered: would variables be equations or expressions?

Sat, 20 Oct 2018 02:26:14 +0000

A variable is a letter that represents unspecified numbers. One may use a variable in the same manner as all other numerals.

In Given example 24 + 5x is an expression and here the variable is x.

Answered: A soccer goalie has a save percentage of 95%. What is the probability that the goalie will not make the next save?

Thu, 18 Oct 2018 07:03:30 +0000

With the event being 1 and the chance that she will block it 95%, also known as .95, the remainder would be .5, also known as 5%.

Answered: Simplify the following expressions by combining like terms

Sat, 29 Sep 2018 19:45:45 +0000

6(m − 3n) + 3m(n + 5) − 2n(3 − m) = 6m − 18n + 3mn + 15m − 6n + 2nm

= 6m + 15m − 18n− 6n + 3mn + 2nm

= 21m − 24n + 5mn

Answer :

6(m − 3n) + 3m(n + 5) − 2n(3 − m) = 21m − 24n + 5mn

Answered: Please explain step by step.

Fri, 28 Sep 2018 17:11:39 +0000

The Equation is

D = r + ( D / t )

Subtract ' (D/t) ' from each side

D - (D/t) = r + ( D / t ) - (D/t)

(Dt - D ) / t = r

D(t - 1) / t = r

D(t - 1) = tr

D = tr / (t - 1)

Answer :

D = tr / (t - 1)

Answered: -5(4x - 2y + 6m - 12) + 15 - 7y - m + 6x simplfied

Tue, 25 Sep 2018 01:42:15 +0000

The Expression is

-5( 4x - 2y + 6m -12 ) + 15 - 7y - m + 6x

= -20x + 10y - 30m + 60 + 15 -7y - m + 6x

= -14x + 3y - 31m + 75

Answered: What is the solution set to the following inequality?

Fri, 07 Sep 2018 14:14:22 +0000

Given inequality

16 ≤ 12x + 4 ≤ 20

Subtract 4 from the above inequality

16 - 4 ≤ 12x + 4 - 4 ≤ 20 - 4

12 ≤ 12x ≤ 16

Devide total inequality with 12

12/12 ≤ (12x)/12 ≤ 16/12

1 ≤ x ≤ 4/3

1 ≤ x ≤ 1 1/3

Answer :

Answer is option (d) i.e. 1 ≤ x ≤ 1 1/3

Answered: Evaluate

Thu, 28 Dec 2017 14:48:42 +0000

Substitute x = 3, y = - 6 in the expression (xy)/(x-y)

(xy)/(x-y) = [ (3)(-6) ] / [(3) - (-6) ]

= [ -18 ] / [3 + 6 ]

= [ -18 ] / [9 ]

(xy)/(x-y) = -2

Answered: Use properties of logarithms to rewrite the expression

Thu, 28 Dec 2017 14:42:48 +0000

log_9 (x^2 -7x + 10) - log_9 (x^2 - 4) + log_9 (x + 2)

= log_9 (x^2 -5x - 2x + 10) - log_9 (x^2 - 2^2) + log_9 (x + 2)

= log_9 [ x(x - 5) - 2(x - 5) ] - log_9 [ (x + 2)(x - 2) ] + log_9 (x + 2)

= log_9 [ (x - 5)(x - 2) ] - log_9 [ (x + 2)(x - 2) ] + log_9 (x + 2)

= log_9 { [(x - 5)(x - 2)] / [ (x + 2)(x - 2) ] } + log_9 (x + 2)

= log_9 [(x - 5) / (x + 2)] + log_9 (x + 2)

= log_9 { [(x - 5) / (x + 2)] (x + 2) }

= log_9 (x - 5)

Hence

log_9 (x^2 -7x + 10) - log_9 (x^2 - 4) + log_9 (x + 2) = log_9 (x - 5)

Answered: The value of x

Sat, 23 Dec 2017 14:44:27 +0000

The expression is x + x(x^x)

Substitute x = 2 in above expression

x + x(x^x) = 2 + 2(2^2)

= 2 + 2(4)

= 2 + 8

= 10

Hence the Answer is option 'a'

Answered: The value of x to the nearest tenth is:

Sat, 23 Dec 2017 14:38:53 +0000

The equation

(0.2)^x = 2

Apply lolgorithm to each side

log (0.2)^x = log 2

x [log (0.2) ] = 0.3010 [Since log 2 = 0.3010]

x [ log (2/10) ] = 0.3010

x [ log 2 - log 10 ] = 0.3010

x [ - 0.699 ] = 0.3010

x [ 0.3010 - 1 ] = 0.3010

x = 0.3010/ (-0.699}

x = - 0.430

x = - 0.4 [The value of 'x' to the nearest tenth]

Ans : Option 'c'

write an integer describing how the raise will affect her paycheck.

Sat, 23 Dec 2017 10:49:07 +0000

Mrs. Rodger got a weekly raise of $145. If she gets paid every other week, write an integer describing how the raise will affect her paycheck.

Answered: How to solve equation by first clearing fraction or decimal 2.3m-11= -29.4

Thu, 09 Nov 2017 10:55:40 +0000

2.3m - 11 = -29.4

Add 11 to each side

2.3m-11+11=-29.4+11

2.3m = -18.4

Divide each side by 2.3

2.3m/2.3 = -18.4/2.3

m =8

-----------------------

-1.2m + 1.25 = 0.77

Subtract 1.25 from each side

-1.2m + 1.25-1.25 = 0.77-1.25

-1.2m=-0.48

Divide each side by -1.2

-1.2m/-1.2 = -0.48/-1.2

1.2m/1.2 = 0.48/1.2

m =0.4

Answered: v(6+5v)

Thu, 09 Nov 2017 10:36:01 +0000

v(6+5v)

Apply distributive property: a(b+c) = ab + ac

(v)(6)+(v)(5v)

6v+5v^2

Answered: Solve the inequality below. Write the solution set using interval

Sun, 15 Oct 2017 16:43:01 +0000

-4≤-2(x+1)<10

Divide each side by -2.

2≥ x+1>-5

Add -1 to each side.

1≥x>-6

-6<x≤1

Solution interval is (-6,1]

The graph on number line is

Answered: Solve the equation

Sat, 14 Oct 2017 18:28:39 +0000

|3x+8|=5x-8

3x+8=5x-8 or 3x+8=-(5x-8)

3x+8=5x-8 or 3x+8=-5x+8

5x-3x=8+8 or 3x+5x=8-8

2x=16 or 8x=0

x=8 or x=0

Verifying:

For x=8

|(3*8) +8|=(5*8)-8

|24+8|=40-8

|32|=32 , true

for x=0

|(3*0) +8|=(5*0)-8

|0+8|=0-8

|8|=-8 ,false

So the only solution is x=8

Answered: what is the radius of pizza

Sat, 14 Oct 2017 18:21:11 +0000

Circumference of pizza, P = 2pir

2pir =8pi

2r = 8

r = 4

Answered: find domain algebrically

Sat, 14 Oct 2017 02:49:07 +0000

Set the expression inside the square root greater than to zero.

6x-2>0

6x>2

x>2/6

x>1/3

Write the answer using interval notation.

(1/3,∞)

Answered: Find the domain of g(x) = sqrt{2x^2+3} Please show the steps

Fri, 13 Oct 2017 16:55:25 +0000

g(x) = sqrt{2x^2+3}

Domain: 2x^2+3 >=0

it is true for all 'x'

Thus, domain is (-infinity , infinity )

Answered: Help with these questions.

Wed, 16 Aug 2017 16:22:29 +0000

Arnold started with

He spent amounts at various stores

Find when he was finished amount by rounding to the nearest dollar.

Option 3 is right answer.

A meteorologist tracked the increase and decrease of rain totals in inches from the previous year.

The four months are January -1.34, February +2.68, March + 1.79, April -0.87.

Find the change from the previous year by adding the totals rounded to integers.

Option 1 is right choice.

Carly is laying carpet in a square foyer with sides of each.

Find the amount of carpet she will need for the foyer.

rounds to

Therefore,

Option 4 is right answered.

Answered: lines through each pair of points are paralell, perpendicular, or neither. (2, 4) and (6, 1); (1, -2) and (-3, 1)

Fri, 07 Jul 2017 14:30:42 +0000

The points are

Find the points are parallel, perpendicular, or neither.

Find Slope:

Substitute in the slope formula.

If two lines are parallel, then slope is

Perpendicular lines slope is

Check the lines are parallel or perpendicular.

Therefore, Those lines are parallel.

Answered: the sum of two numbers is 41and the difference is 1 what are the numbers

Mon, 19 Jun 2017 19:03:37 +0000

The sum of the two numbers

The differences of the two numbers

Let are the two unknown numbers.

The equations are

Simplify to find the unknown values.

The values are

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Wed, 31 May 2017 16:53:19 +0000

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Answered: 7x= 5y + 1

Fri, 28 Apr 2017 13:23:16 +0000

The equation is

Solve for

Answered: 6. Ravi is 3/4 as tall as Sam. Mike is 5/3 as tall as Ravi. Find the ratio of Mike's height to Sam's height.

Tue, 07 Mar 2017 15:00:33 +0000

Step 1:

Ravi is as tall as Sam.

Consider the equation is

Mike is as tall as Ravi.

Then, the equation is

Solve the two equation to find ratio of mikes and sam height.

Solution:

The ratio of Mike and Sam Heights are

Answered: 6. Ravi is 3/4 as tall as Sam. Mike is 5/3 as tall as Ravi. Find the ratio of Mike's height to Sam's height.

Tue, 07 Mar 2017 14:57:29 +0000

Ravi is as tall as Sam.

Consider the equation is

Mike is as tall as Ravi.

Then, the equation is

Solve the two equation to find ratio of mikes and sam height.

The ratio of Mike and Sam Heights are

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Soil analysis is the active apparatus of the Watering Can

Sat, 10 Dec 2016 12:12:49 +0000

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High Frequency Welding Machine is authentic as a awning fabricated of metal

Sat, 10 Dec 2016 11:52:40 +0000

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FIFA Bank Soccer Apple Cup Bahamas 2017

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Answered: There are 100 pens sofia paid 8 dollars, cameron paid 1 dollar, and keylon paid two dollars how many pens would each get

Thu, 08 Sep 2016 14:18:16 +0000

Step 1:

There are pens have.

Let represents the cost of pens.

Find pens cost.

Find how many pens would each get.

(i)

Sofia paid ,then

(ii)

Cameron paid , then

(iii)

Keylon paid ,then

Solution:

Sofia gets pens.

Cameron gets pens.

Keylon gets pens.

Answered: (7 to the 4th power) squared

Mon, 16 May 2016 13:52:18 +0000

The expression is .

The value of the expression is .

Answered: Matrices question help please!?

Sat, 09 Apr 2016 17:22:30 +0000

Step 1:

The system of equations are

Write the equations into matrix form ,

Write the equations into matrix form , where is coefficient matrix,

is variable matrix and is constant matrix.

Solve the equations in Gauss-Jordan method.

The augmented matrix is .

Step 2:

The augmented matrix is

Apply elementary row operations to obtain a reduce the row-echelon form.

Let are represents first row, second row and third row.

Solution :

The solutions of the augmented matrix are and .

Answered: Inverse of coefficient matrix question!?

Sat, 09 Apr 2016 16:30:17 +0000

Step 1:

The system of equations are

Write the equations into matrix form , where is coefficient matrix,

is variable matrix and is constant matrix.

Definition of inverse matrix :

If is an then , where .

Let , then .

, then has an inverse.

Step 2:

Cofactor of is

Cofactor of

Step 3:

Find .

Solution :

The inverse of the is