Which quadratic equation has the roots -1+4i and -1-4i a. x^2+2x+2=0 b. 2x^2+x+17=0 c. x^2+2x+17=0 d. 2x^2+x+2=0

C

Step-by-step explanation:

Solve the quadratic in answer choice C using the quadratic formula:

.

Here a=1, b=2, and c=17.

Substitute and you'll have:

answer: the value of x is 7cm

step-by-step explanation:

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,