Answer is in the picture:
<h3>
Answer: 39</h3>
========================================================
Explanation:
You can use the nCr formula shown below

where n = 39 and r = 1. However, you could also use the identity

which basically says there are n ways to pick 1 item if you are given a choice of n items. In this specific case, we have 39 items total, and there are 39 ways to pick one item.
<u>Answer:</u>
• Equation = 
• length = 56 ft
• width = 32 ft
<u>Step-by-step explanation:</u>
The ratio of the length to width is 7:4.
∴ 
⇒
[Equation 1]
We know that the perimeter of the garden is 176 feet.
∴ 
⇒ 
⇒
[From Equation 1]
⇒ 
⇒ 
⇒ 
⇒ 
We know from Equation 1 that:
∴ 
⇒ 
Answer:
x = -3
Step-by-step explanation:
15 - 2x = -7x
add 2x
15 = -5x
divide by -5
-3 = x