I need some help. THIS IS DUE IN 15 MINUTES! NO LINKS! X = 7

Allie answered 72% of the questions on her math test correctly. if she answered 18 questions correctly, how many questions were on the test?

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days

What does independent variable and dependent variable mean in math?