Find the value of:
a) 5x when x = 6
b) 3y when y = -7
c) 10z when z = 0.8

Atown has a population of 12000 and grows at 3.5% every year. what will be the population after 7 years, to the nearest whole number?

(c) a vine called the mile-a-minute weed is known for growing at a very fast rate. it can grow up to 0.5 ft per day. how fast in inches per hour can the mile-a-minute weed grow up to? show your work using the correct conversion factors.

Find the least common factor denominator for these two rational 7/x^2 and 7/5x