The number of 8th graders in choir is three times the number of the 7th graders. if there are 48 8th graders choir how. many 7th graders are in choir

Ineed with number 17 i don’t get it at alll

What is the length of the unknown leg in the right triangle ?

Answer asap ill give ! ’ a sample of radioactive material decays over time. the number of grams, y , of the material remaining x days after the sample is discovered is given by the equation y = 10(0.5)^x. what does the number 10 represents in the equation? a. the half-life of the radioactive material, in days b. the amount of the sample, in grams, that decays each day c. the time, in days, it will take for the samples to decay completely d. the size of the sample, in grams, at the time the material was discovered