After 1/4 hour there are about 7 mg of medicine left. After 3/4 hour there are about 3.5 mg of medicine left. About how many mg of medicine are left after 1 3/4 hours?

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

Ireally need subtract and simplify.(-y^2 – 4y - 8) – (-4y^2 – 6y + 3)show your work, ! i will mark you brainliest but you have to show your work.

Which of the following is closest to 32.9 x 7.5? a: 232 b: 259 c: 220 d: 265