Orval mows lawns to earn money. He can mow 12 lawns in 4 hours. He earns $15.00 for each lawn. Orval is saving up to buy a new computer that costs $450.00. How many hours does Orval need to work to earn enough money to purchase the computer?

10 hours

Step-by-step explanation:

happy to help

just get this app called photo math it should be able to do those

the above table 1 will calculate the population size (n) after a certain length of time (t). all you need to do is plug in the initial population number (no), the growth rate (r) and the length of time (t). the constant (e) is already entered into the equation. it stands for the base of the natural logarithms (approximately 2.71828). growth rate (r) and time (t) must be expressed in the same unit of time, such as years, days, hours or minutes. for humans, population growth rate is based on one year. if a population of people grew from 1000 to 1040 in one year, then the percent increase or annual growth rate is 40/1000 x 100 = 4 percent.

step-by-step explanation: