Step-by-step explanation:
perimeter of semicircle=πr+2r

Answer:
7
Step-by-step explanation:
x + 8 = 15
Subtracting 8 from both sides,
x = 15 - 8
=> x = 7
Answer:
Height is approximately 30m
Step-by-step explanation:
Hope it helps you!!

This equation has the next form:

To find if the equation has two complex solutions we have to check if the discriminant is negative, as follows:

Then, the first case has two complex solutions.
In the second case,

The discriminant in this case is:

Then, the second case has two complex solutions.
In the third case,

The discriminant in this case is:

Then, the third case has two real solutions.
In the fourth case,

The discriminant in this case is:

Then, the fourth case has two complex solutions.
Answer:
11x-4
Step-by-step explanation:
10x + x = 11x
-7 + 3 + -4
keep the sign in front of the number/variable