Answer:c
Step-by-step explanation:
Answer:
2 cm^2/sec
Step-by-step explanation:
side of cube ---- x cm
volume = x^3
d(volume)/dt = 3x^2 dx/dt
when c = 20, d(volume)/dt = 10 cm^3/sec
10 = 3(20^2) dx/dt
dx/dt = 10/1200 = 1/120 cm/sec
Surface area = SA = 6x^2
d(SA)/dt = 12x dx/dt
so when x = 20, as above
d(SA)/dt = 12(20)(1/120) cm^2/sec
= 2 cm^2/sec
Hello thee i hope you are having good day :) Your Question: 15-foot piece of string is cut into two pieces so that the longer piece is 3 feet longer than twice the shorter piece. If the shorter piece is x feet long, find the lengths of both pieces.
so firstly you would do L = 3 + 2x S = x X + (3 + 2x) = 15 X + 3 + 2x = 15
3x + 3 = 15 then you would take away that 3x = 15 - 3 this would equal 12 so x = 4 and then add it 3+ 2x = 3+2 (4) = 3 + 8 = 11 Short piece is 4 feet Long piece is 11 feet.
Hopefully that helps you ❤
the answers are 5.)b 6.)c.