To find Isaac's total bill for purchasing two pairs of shoes, add the sales tax to the total cost of the shoes.
Isaac is purchasing two pairs of shoes - one pair for $37.00 and the second pair for $42.00.
To find the total bill, we need to calculate the sales tax on the total cost of the shoes and add it to the cost.
First, find the total cost of the shoes: $37.00 + $42.00 = $79.00.
Next, calculate the sales tax amount by multiplying the total cost by the tax rate: $79.00 × 0.07 = $5.53.
Finally, add the sales tax amount to the total cost to find the total bill: $79.00 + $5.53 = $84.53.