A teacher who has taught 5 years will make $42000. In 10 years they will make $42840. What is the percent increase that the teacher will make after 5 more years of teaching?

Answer question above and explain each step : )

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)