Answer: R = 2
Step-by-step explanation: If (8 + 7)r = 30, then 15r = 30.
To solve for r, we can divide both sides of the equation by 15.
15r = 30
r = 30 / 15
r = 2
Therefore, the value of r is 2.
We can check our answer by substituting 2 back into the original equation:
(8 + 7)(2) = 30
15(2) = 30
30 = 30
Both sides of the equation are equal, so our answer is correct.
I hope this helps!