7. A rectangle's length is 3 feet shorter than 4 times the width. If we use w to represent the rectangle's
width, use a polynomial to represent the rectangle's area in expanded form.

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50.

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g

Find the value of x. also give me an explanation so i can complete it to other questions as well, : )