Jina received a $70 gift card for a coffee store. she used it in buying some coffee that cost $8.63 per pound. after buying the coffee, she had $35.48 left on her card. how many pounds of coffee did she buy

Can someone me with this problem . show your work .

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days