I) 5(3x + 2)
ii)3(5x+2)
iii) 15(x+1)
iv) 15(x+5)
v) X(15x+1)

i) 15x+10

ii) 15x+6

iii) 15x+15

iv) 15x+75

v)15x^2+x

Step-by-step explanation:

you have to substitute the number outside the brackets to all the variables inside by multiplying.

(^) means power.

b

step-by-step explanation:

t = 3

step-by-step explanation:

put t = 3 in this expression :

(3²-1)(3²-2)(3² - 3)(3² - 4) = 8×7×6×5 = 56×30 = 1680