Step-by-step explanation:
circumference = 2πr
5) 2πr
=2π(7)
= 43.98 mm
7) 2πr
=2π(29) -> 58÷2=29
=182.21 yd
We have to set up 2 different equations if we are to solve for 2 unknowns. The first equation is x = y + 4. One number (x) is (=) 4 more than another (y + 4). Since we have determined that x is larger (cuz it's 4 more than y), when we set up their difference, we are going to subtract y from x cuz x is bigger. The second equation then is

. In our first equation we said that x = y + 4, so let's sub that value in for x in the second equation:

. Expand that binomial to get

. Of course the y squared terms cancel each other out leaving us with 8y + 16 = 64. Solving for y we get that y = 6. Subbing 6 in for y in our first equation, x = 6 + 4 tells us that x = 10. Yay!
Answer:
The question confused me a bit because of the different numbers.
The answer would be
w(2 * 18), which would be the same as choice a if the numbers weren't different.
Step-by-step explanation: