H E L P M E

what is 22 - 12 + 9 (40 / 2) ??

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.

60 musicians applied for a job at a music school. 14 of the musicians play both guitar and drums, 28 play drums, 18 play the guitar. what is the probability that the applicant who gets the job plays drums or guitar?