Amy has saved $725 for a guitar and lessons. her guitar costs $475 and guitar lessons are 25$ per hour how many lessons can she afford?

If you answer right ill give brainliest, : )

2/3(-6y+9x) expand each expression using the distributive property

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.