When people buy wood to burn in a stove they purchase it in units of cords(stacks that are 128 cubic feet). Camilla had 3 cords of wood delivered and stacked. She noticed people stacking the wood could stack 3/10 of a cord in 2/5 of an area​ (a) What is the rate they are stacking the wood in cords per hour?
(b) At a rate of (a), how many hours will it take for them to stack all three cords

step-by-step explanation:

we have

using a graphing tool

see the attached figure

this is a quadratic equation (vertical parabola) open up

the vertex is a > vertex

the domain of the function is all real > interval (-∞,∞)

the range of the function is the > [-6.125,∞)

the function has two x->   and

the function is increasing over the > (0.25,∞)

the function is decreasing over the > (-∞,0.25)

yx = 36

step-by-step explanation:

cos f = opposite side/ hypotenuse

cos f = yw / yx

we know cos f = 4/9 and yw =16

4/9 = 16/yx

multiply each side by yx

4/9 yx = 16/ yx * yx

4/9 yx = 16

multiply each side by 9/4

9/4 * 4/9 yx = 16 *9/4

yx = 36

apex answer is: true.

43

step-by-step explanation:

not sure if this is supposed to be a trick question. 43 is the only one that makes any sense.