Answer:
20, 700
Step-by-step explanation:
In the first scenario, we know that we put 500$ in initially, so our total is 500+ something. This sometimes is 10$ for each month, meaning that if we set m to the number of months, our total, or t, would be equal to 500+10*m. Similarly, for the second scenario, our total would be 100+30*m. As we want to find a month, m, where 100+30m=500+10m, we can start by subtracting 100 from both sides, where we get 30m=400+10m. Next, we can subtract both sides by 10m and then divide both sides by 20, resulting in m=20
For the second part, to find the amount Tina saved each way, we simply need to find the total. We know that the total is equal to 100+30*20, or 500+10*20, so we can use either one to find the total of 700
