28. perform the indicated operations. simplify your answer a. (x+3)(2x-1) b. (x+5)(x-5) c. (x+2)^2 d. (2x^2 +11x- + 6) 29. convert to scientific notation a. 0.125 b. 435,000 30. factor 3x +x-4 31. factor 4x^2 -16y= 32, factor x+8=33. solve the equation x^2-2x-15 = 0 34. simplify 35. perform the indicated operations. simplify your answer x^2+4x +4 a. 3x+2x^2 5x15r x-2 x +1 3x +34 45

it would be:

c.parallelogram.

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:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -