I wasn’t here for this lesson and im lost

Step-by-step explanation:

The equation written just below Q8 is the vertex form, which makes it easy to know about the vertex of a parabola, which is the point where it changes direction, its max or min. "a" represents a constant (irrelevant to vertex but important later), "h" is the x position of the vertex (you flip the sign of h when putting it in an equation), and "k" is the y position of the vertex.

First thing's first, you want to plug in your desired vertex values: h = 4 & k = 5, so y = a(x - 4)^2 + 5 (notice sign flip!)

Then, you want to find a so that the y value is 2 when x is 1, so plug those values in and solve for a.

2 = a(1 - 4)^2 +5 (substitution)

2 = a(9) + 5 (simplification)

-3 = 9a (subtracting 5 from both sides and re-writing)

-3/9 = a (divide both sides by 9)

-1/3 = a (simplify the fraction.

Plug this into your equation and your final answer should be y = -1/3(x - 4)^2 + 5

Let me know if you need more of an explanation! I know how hard it can be to get math if you were absent when it was taught, and I hope it goes well.

the answer is c)8

step-by-step explanaction:

answer: input the dimensions of the room to be painted. click the button to calculate the amount of paint and man-hours needed for this job.

interior paint coverage depends on the brand of paint used. the coverage amount is listed on the label of the paint can. use this to adjust the values in the paint coverage section below. paint usually is applied at 350 to 400 square feet per gallon (primer at 200 to 300 square feet per gallon).

step-by-step explanation: