Factor the expression. 3r2 – 75 (3r –5)(r + 5) (3r +5)(r – 5) 3(r – 5)(r + 5) 3(r – 5)(r – 5)

factor 3r^2-75

 you would move the 3 to the outside of the parenthesis

then you have 5*5 = 25 and multiply that by the 3 to get the 75

 3(r-5)(r+5)

y < -3

step-by-step explanation:

-3y - 2 > 7

-3y -2 + 2 > 7+2

-3y > 9

-3y/-3 < 9/-3   (change the inequality sign when multiplying or dividing by a negative number)

y < -3

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 -