Answer:
10
Explanation:
Make our unknown equal to x, in this case his current age.
In 20 years he will be three times as old as he is now, in other words:
x + 20 = 3x
Now solve the equation:
20 = 3x - x
20 = 2x
10 = x
Grade 3.141592653589793238462643383279502884197? Or what?
Answer:
243cm^3
Step-by-step explanation:
By Pythagoras' Theorem,
height of the prism ^2 + 5.4^2 = 7.8^2
height of the prism = ±√(7.8^2 -5.4^2) = ±5.6285cm (5s.f.) (rej. - 5.6285 since height > 0cm)
volume of the prism = 1/2 x 5.4 x 5.6285 x 16 = 243cm^3 (3s.f.)
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Answer:
38.2842 m
Step-by-step explanation:
The acceleration is given by ...
a = ∆v/∆t
and the distance traveled is given by ...
d = 1/2at^2
So the distance we're looking for is ...
d = (1/2)(21.0366 m/s)/(8.06 s)(5.41632 s)^2 = 32.2842 m