Answer:
B?
Step-by-step explanation:
I think is B because solar power never run out.
（For the next 5000000000 years at least...）
Answer:
44°
Step-by-step explanation:
The sum of the angles in a triangle = 180°
In an isosceles triangle the base angles are equal, thus
base angle = 
= 
= 44°
Answer:
it is easy use the formula of triangle which is 1/2(base × height) and base is the side where the height touches and height means the perpendicular line.
And in some cases there may be the use of pythagoras theorem
Answer: -3.75
Step-by-step explanation:
10000000000% sure because I took the test
R/9 = -21
Multiply by 9
r = -189
