You have $85 in your bank account. Each week you plan to deposit $7 from your allowance and $15 from your paycheck. The equation b=85+(15+7)w gives the amount b in your account after w weeks. How many weeks from now will you have $210 in your bank account?

6 weeks

Step-by-step explanation:

So the amount b we will have in our account w weeks from now is given by the equation:

To find out after how many weeks from now we will have $210, substitute 210 for b and solve for w:

Subtract 85 from both sides:

Add within the parentheses:

Divide both sides by 22:

In other words, we will have $210 after approximately 6 weeks.