the product of 16 and c is increased by 6 to equal the qoutient 25 and 9. what is c?
Assuming 9 is the divisor and your information is accurate,
16c + 6 = 25/9
Multiply both ides by 9.
144c + 54 = 25
144c = 25 - 54 = -29
Divide both sides by 144.