Answer:60
Step-by-step explanation:
15.0 x 4 = 60
Answer:
40c +20
Step-by-step explanation:

Expand

= 
Answer:
3 3/8 seconds.
Step-by-step explanation:
When it reaches the ground h = 0 so:
54t - 16t^2 = 0
16t^2 - 54t = 0
2t(8t - 27) = 0
t = 0 or t = 27/8 (we ignore the t = 0 ) so:
t = 3 3/8 seconds.
Answer:
-4
Step-by-step explanation:
-3-9 +8
-12 + 8
= -4
Answer:
Area = pi r squared
Step-by-step explanation:
If you need to, sometimes your teacher will ask you to leave you answers in terms of pi, or keep pi as 3.