Solve by completing the square. .

the solutions are 0 and 7

Step-by-step explanation:

4r²-28r=-49 take out the 4 to make it a simple trinomial

4(r²-7r)=-49 find half of 7 and square it

4(r²-7r+12.25)=-49 now factor

4(r-3.5)²=-49 divide by 4

(r-3.5)=-12.25 now square root bother sides

r-3.5=+/-3.5 add 3.5

r=3.5+3.5 =7

r=-3.5+3.5=0

529 and 531

step-by-step explanation:

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!