5x+2y+ 2z=7 15x+6y +6z=7 2x-5y+2z=4

for equation 1 is 5, 2 and 0

Step-by-step explanation:

Step 1: you know the answer to this eqution is 7 but you don't know what numbers do you  put in place of the variables to get 7 so you have to figure out the numbers.

Step 2: 5x + 2y + 2z = 7 okay so the number is very low and if we multiply 5, 2, or 2 by 2 then we won't get 7 so the answer will most likely be multiply each number by 1 EXCEPT the last 2.

Step 3: so lets change the equation 5 x 1 + 2 x 1 + 2 x 0= 7 and lets solve it 5 + 2 + 0 = 7

So your answer is 5, 2 and 0  

you can comment on this question an ill answer the rest in the comments

please mark me brainliest

answer: there are x+184 pages in olivia's book.

step-by-step explanation:

let the total number of pages in the book which olive has already read be x.

then if olive has 184 pages left to read, then the total number of pages are in olive's book= pages she has read+pages she has left to read

therefore, the total number of pages in olivia's book=

hence, there are x+184 pages in olivia's book.

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer