According to the given data we have the following:
15 - 21p
correct expression?
To find the correct expression we need to check which expression is the correct one by multiplying the number which is outside of parentesis to the numbers inside of the parentesis.
Therefore,
15 - 21p
The right option in this case is:
3(5 - 7p)
3 times 5 is=15
3 times -7=21
Therefore 3(5 - 7p)= 15 - 21p