First, we want to find the GCF of 15 and 21, which is 3. Now we do 15 divided by 3 and 21 divided by 3, which gives us 5 and 7. To rewrite the expression, we take the GCF and put it on the outside of the parenthesis. Inside the parenthesis, we put 5 + 7. So it'll look like this:
3(5 + 7)
Well it's 4 time the radius, so 4r
And it's 3 less than that, so
4r - 3 is the height
Answer:
• for x = 2a√t, make t the subject:

• then find y:

4 6/9= 38/9
7 5/3= 26/3
3 7/8= 31/8
5 19/14 =89/14
I think the answer is an auction!