Step-by-step explanation:
It is given that,
The diameter of a tennis ball is 2 cm and the diameter of the softball is 1 cm. So, radius of tennis ball is 1 cm and radius of softball is 0.5 cm.
Both balls are in the shape of sphere. Half of the balls will becomes hemisphere. The surface area of hemisphere is given by :

Taking ratio of both balls, i.e.


So, the surface area of a half of the tennis ball is 4 times of he surface area of a half of the softball.
Answer:
B
Step-by-step explanation:
spent 22 ---> x - 22.
at least 28 left ---> (x - 22) >= 28
SOLVE:
x - 22 >= 28
x >= 50
Answer:
Step-by-step explanation:
4^3 × 4^n = 4^12
Using indices multiplication rule
4^(3+n) = 4^12
4 cancelled out 4
Therefore: 3 + n = 12
n = 12 - 3
n = 9
129 degrees is the correct answer for the missing angle number 1 :)