Step-by-step explanation:
a)2×30=60J
b) 1.25×0.28 = 0.35J
Answer:
167.6 units^3
Step-by-step explanation:
Find the volume of the entire cone, and then divide the result by 4 to obtain the volume of the quarter cone:
Formula for the volume of a cone is V = (1/3)(base area)(height)
In this case the volume of the entire cone is V = (1/3)(pi)(8)^2*(10), or
670.21.
Taking 1/4 of this, we get the volume of the quarter cone:
670.21/4 = 167.6 units^3
Answer:
weeks
Step-by-step explanation:
Given
It takes 14 weeks to empty a lake
also it takes 20 weeks for a river to fill the lake
Part of lake empty in 1 week 
Part of lake filled in 1 week is 
And if both works simultaneously then


therefore it takes
weeks to fill it
2 - 3d = 4d - 19
Add the opposite to both sides to get the variable on the left side only.
2 - 3d = 4d - 19
-4d -4d
2 - 7d = - 19
Then get the terms w/o variables on the right,
2 - 7d = - 19
-2 -2
-7d = -21
Then divide by the number paired with the variable.
--7d = -21
----- ----- ; d = 3
-7 -7
Final answer = 3
Hope I helped :)
Cosine Rule again:-
cos A = (9^2 - 6^2 - 14^2) / (-2*6*14)
= 0.8988
m < A = 26 degrees