): What is the expression which should be added to
8 - 3a² + 2a to get the result 5 +40°-7a)?

sinn is the total amount of students now and m were the students before, you subtract them both (n-m) and divide that by m. then, since to get a percentage from a fraction you have to multiply by 100, your answer should look like this: n-m/m*100

step-by-step explanation:

b, i believe, but not sure.

you just switch the numbers basically so it would be 3/17

question

given the diagram below, what is md?

the sum of the interior angles is 360°

take away from 360 the sum of the knows angles and you will have the angle d.

360 - 108 - 108 - 72 = 72°