N+6 (10n+7)= simply expression

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.