Answer:
Step-by-step explanation:
S=4πr²
ds/dt=4π×2r×dr/dt=8πr dr/dt
dr/dt=60 cm/min
ds/dt=8π×60r=480πr
r=16,t=0
at t=2,r=16+32=48 cm
so ds/dt=480π×48=23040 πcm²≈72382.79 cm²
2.

Answer:
x ≈ 6.36
Step-by-step explanation:
Using the Sine Rule in Δ GHI
=
, substitute values
=
( cross- multiply )
x sin127° = 21 sin14° ( divide both sides by sin127° )
x =
≈ 6.36 ( to the nearest hundredth )
Answer:
The maximum height of soccer ball is 12.25 ft.
Step-by-step explanation:
It is given that Tiffany kicks a soccer ball off the ground and in the air, with an initial velocity of 28 feet per second. It means v = 28 ft.
Given formula is

The initial height of ball is 0.


The height of ball defined by the function


It is a downward parabola and the vertex of a downward parabola is the point of maxima.
The vertex of a parabola
is



Therefore the maximum height of soccer ball is 12.25 ft.
Answer:
20
Step-by-step explanation:
if their ages total is 60 and gabrielle's is two times mikhail's age, that means that Mikhail would be twenty because their age times 2 would be 40 and 40 plus 20 is 60.