15)

Observe the graph,

The line passing through the points are $\"\"$

Find the linear equation.

$\"\"$

The line equation is $\"\"$

Substitute $\"\"$

$\"\"$

Graph of the equation is $\"\"$

True.

\ \ 17)

Observe the graph,

The graph is vertical parabola and open upwards.

At y-axis touches at 1 and 4 units..

The graph is passing through the point at origin.

General form of the verical parabola equation is $\"\"$

The parent function is $\"\"$

True.18)

Step 1:

Observe the graph,

The graph is vertical parabola and open upwards.

The graph is passing through the point at origin.

COnsider the graph the points are $\"\"$

General form of the verical parabola equation is $\"\"$

Substitute $\"\"$

$\"\"$

The graph function is $\"\"$

The parent function $\"\"$ by multiple factor of $\"\"$

Solution:

Option 1 is correct answer.

26)

The equation is $\"\"$

Solve the equation and find roots.

$\"\"$

True.