please help? i cant figure it out

60x + 75 :))
Explanation: were disrupting 15 to 4 & 5 so were multiplying because when a number is in parenthesis like this a(b) we multiply.
Answer:
60x + 75
Step-by-step explanation:
When using distributive property, multiply the number on the outside of the parenthesis by the numbers on the inside of the parenthesis.
Here, the number outside of the parenthesis is 15.
15 (4x + 5)
15 ⋅ 4x = 60x
15 ⋅ 5 = 75
KEEP WHICHEVER SIGN IS IN THE MIDDLE OF THE PARENTHESIS.
15 (4x + 5) = 60x + 75