Answer:
the answer is D
Step-by-step explanation:
if you look on the graph and compare the statements you'll see none of them correlate except for the last one. 7 erasers cost 3.50, since the point on the graph is (7, 3.50)
The ladder, the ground and the wall form a right triangle; the ladder length (L) is the longest side of this triangle. L^2 = h^2 + x^2, where h represents the height of the point on the wall where the ladder touches the wall, and x represents the distance of the base of the ladder from the wall.
We need dh/dt, which will be negative because the top of the ladder is sliding down the wall.
Starting with h^2 + x^2 = L^2, we differentiate (and subst. known values such as x = 5 feet and 4 ft/sec to find dh/dt. Note that since the ladder length does not change, dL/dt = 0. This leaves us with
dh dx
2h ---- + 2x ----- = 0.
dt dt
Since x^2 + h^2 = 15^2 = 225, h^2 = 225 - (5 ft)^2 = 200, or
200 ft^2 = h^2. Then h = + sqrt(200 ft^2)
Substituting this into the differential equation, above:
2[sqrt(200)] (dh/dt) + 2 (5) (4 ft/sec) = 0. Solve this for the desired quantity, dh/dt:
[sqrt(200)] (dh/dt) + (5)(4) = 0, or
dh/dt = -20 / sqrt(200) = (-1.41 ft / sec) (answer)
This result is negative because the top of the ladder is moving downward.
ANSWER:
- [ 12 / ( x - y ) ]
STEP-BY-STEP EXPLANATION:
= 12 / ( y - x )
= 12 / - ( x - y )
= - [ 12 / ( x - y ) ]
Answer:
58
Step-by-step explanation:
58.58 - 0.58 = 58
