factor completely over the set of integers: 16x^4-81. Sara graphed the polynomial y=16x^4-81 and stated "All the roots of y=16x^4-81 are real" Is sara correct? Explain your reasoning answer

Which situation can be modeled by the inequality 5 + 10w ≥ 45? a. you start with $5 and save $10 a week until you have at least $45. b. you start with 5 baseball cards and purchase 10 cards every week until you have at most 45 cards. c. you start with 5 water bottles and purchases cases of 10 water bottles each until you have a total of 45 water bottles. d. you spend $5 plus $10 per week until you have less than $45.

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m