Help me so solve this

Below.

Step-by-step explanation:

Finding the derivative:

y' = 10x + 12.

At x = -5 ,  y' = -50+12 = -38.

This means the function is decreasing at this point.

The second derivative is 10 (positive) so it is convex at this point.

set each factor equal to 0

4x-3 = 0

2x-1 = 0

solve for x.

4x-3=0

4x=3

x= 3/4

solve for x. 

2x-1= 0

2x= 1

x= 1/2

eventually after a few more steps, your answer should be 1/2 is less than or equal to x and 3/4 is greater than or equal to x

$9.89

step-by-step explanation:

9.90 = p x .06 x .25 (3/12 changed to a decimal)

9.90 = p x 0.015

9.90 - 0.015 = p

9.89 = p