Answer:
Step-by-step explanation:
1) use this rule: 
× 
2) simplify 4 * 2 to 8
3) simplify 5 * 3 to 15
Answer:
Step-by-step explanation:
Hard to figure out huh
I'm guessing 90 hours because if you add their hours together it'll be 180 if they work together it'll be like half the time which is 90
Answer:
If your money is earning a 5% interest rate annually, then it will take 14.4 years to completely double itself.
Step-by-step explanation:
An easy rule of thumb to remember is to take 72 and divide it by the intrest rate as if it was a whole number. For instance, if you were looking at an 8% interest rate, then it would take 9 years to double.
72/5 = 14.4
Hope this helps!
