Answer:
after 11.07secs
Step-by-step explanation:
Given the height of an object modeled by the equation
H = 16T² - 1960
The height of the object on the surface of water is zero, hence H = 0
Substitute
0 =16T² - 1960
Swap
16T² - 1960 = 0
16T² = 1960
T² = 1960/16
T² = 122.5
T = 11.07
Hence the rock will hit the surface of the water after 11.07secs
Answer:
x = 0, π/4, π, 7π/4
Step-by-step explanation:
sin(2x) = √2 sin x
Use double angle formula.
2 sin x cos x = √2 sin x
Move everything to one side.
2 sin x cos x − √2 sin x = 0
Factor.
sin x (2 cos x − √2) = 0
Solve.
sin x = 0, cos x = ½√2
x = 0, π/4, π, 7π/4
Answer:
5.1586519e+18 is the answer.
Step-by-step explanation:
782.143 weeks in 15 years
2500 (1+.048)^752.143
This is for the first one 85.714286%
This is for the second one
olution for 21 is what percent of 300
100%/x%=300/21
(100/x)*x=(300/21)*x - we multiply both sides of the equation by x
100=14.2857142857*x - we divide both sides of the equation by (14.2857142857) to get x
100/14.2857142857=x
7=x
x=7
now we have:
21 is 7% of 300
