Question

Erna loses 14.5 pounds in 7 months. Now he weighs 156.5 pounds. Which equation can be used to find how much he weighed before?

1. x+14.5 = 156.5
2. x - 14.5 = 156.5
3. 7x + 14.5 = 156.5
4. 7x - 14.5 = 156.5

Shannon opens a savings account with $50. Starting with the first week, each week she deposits $8 into her account. How many weeks does it take her to save $450?
1. 56.25 weeks
2. 62.5 weeks
3. 52 weeks
4. 50 weeks

Answer 1

First question is 2. x + 14.5 = 156.5

Second question is 4. 50 weeks

Explanation:

The first question is relatively simple. To see how much he weighted before then the equation must equal to 156.5 as he weighted before. So x must be bigger than what he used to weight.

The second question you just multiply $8 by the number of weeks so that equation mist equal to $400 + $50 for opening the account.

So 8x + 50 = 450 => x = 50 weeks.