Given the vertex (3, -7) and the point (2,-6). Write the vertex form of the
equation.

Step-by-step explanation:

The vertex form of an equation of the parabola:  

                                                        f(x) = a(x - h)² + k

the vertex is (3, -7)  ⇒   h = 3,  k = -7

so:

     f(x) = a(x - 3)² - 7

The parabola goes through the point (2, -6) ⇒   x=2,  f(x)=-6

-6 = a(2 - 3)²  - 7

-6 = a(-1)²  - 7

+7           +7

1  = a

It means the equation of the parabola in vertex form:

                               f(x) = (x - 3)² - 7

answer: the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.

step-by-step explanation:

the given rate of interest i= 85%

in calculating the monthly payment for a loan with an interest rate compounded monthly, the value of the interest rate per period we use in the formula must be in decimal form.

to convert it in decimal, we divide it by 100, we get

hence, the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.