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Algebra Homework Plz helpppp :) Thx?

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5.) Mike's pay went from $6.50 to $7.25. What percent was his raise? 
9.2% 
10.3% 
11.5%

 
6.) A rectangle's length is five times its width. Its perimeter is 40.8 feet. What is the width of the rectangle? 
3 feet 
3.4 feet 
4.2 feet 


7.) Devan made $20,600 last year. After a raise, she now makes $21,424. What percent was her raise? 
4% 
5% 
7% 


8.) If the second side of a right triangle measures 2 more than twice the first, the third side measures 3 times the first, and the perimeter is 38, what is the measurement of the first side of the triangle?

asked May 10, 2014 in ALGEBRA 1 by anonymous

1 Answer

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5) Mikes pay went from $6.50 to $7.25.

percent of change = (amount of change) / (original amount),

where the amount of change is the new value minus the original value.

Percentage of raise = (difference/old pay rate)100

Differnce = 7.25 - 6.50 = 0.75

Raise is (0.75/6.50)100 = 11.5%

Mike's raise 11.5%

Option 3 is correct answer.

6) A rectangle width = x ft

length of the rectangle = 5x

Perimeter 2(x + 5x) = 40.8 ft

12x = 40.8

x = 40.8/12

x = 3.4

Width of rectangle = 3.4 ft.

Option 2 is correct answer.

7) Devan raises $20,600 from $21424

Difference = $21424 -$20600 = 824

Her raise is (824/20,600)100 = 4%

She raise 4%

Option 1 is correct choice.

8) First side of right triangle = x

Secon side of triangle = 2 + 2x

Third side of triangle = 3x

Perimeter of rectangle (a + b +c) = x + 2 + 2x + 3x 

6x + 2  = 38

6x = 38- 2

6x = 36

x = 6

Measurement of first side of the traingle = 6.

 

answered May 10, 2014 by david Expert

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