Solve the system of equations by substitution -5x + 2 = 0
-8x + y= 0 ​

Apatient is to take 60 mg of an antibiotic on day 1, take 45mg on days 2 and 3, take 30mg on days 4 and 5 and take 15 mg on days 6 and 7. how many total mg will the patient take?

Find the solutions for a triangle with a =16, c =12, and b = 63º

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years