I need this really quick!!

According to Wikipedia, your problems will not be solve.

Inscrutable in short, impossible to understand or interpret.

400 ft

Step-by-step explanation:

H = 160t - 16t^2 = 16t(10 - t)

The minimum/maximum of a quadratic function is always exactly in between the 0 points (or any other points with equal value, as a parabole is symmetrical).

Let's solve for H = 0

16t(10-t) = 0

t = 0 or 10 - t = 0

t1 = 0, t2 = 10

the maximum is at (t1+t2)/2 = 5

H(5) = 16*5(10-5) = 80*5 = 400

Damon

Step-by-step explanation:

Janet charges a $50 fee per visit plus $5 dollars every hour of cleaning.

y = 5x + 50

Damon charges a flat rate of $15 per hour.

y = 15x

Plug 4 into the given equations and solve.

y = 5x + 50

y = 5(4) + 50

y = 20 + 50

y = 70

y = 15(4)

y = 60

Damon's cleaning serving charges less.