(2a-3)+5i=b+(a-1)i, solve for “b”

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

Solve the following inequalities and show the solution on a number line. 3/4 (2x-7) ≤ 5

How do i multiply two digit numbers