Estimate each of the following by first rounding each amount to the nearest dollar before calculating. a pens at \( \$ 4.27 \) each b the total of \( \$ 5.99, \$ 4.78 \) and \( \$ 12.09 \) c \( \$ 56.67 \) divided into three equal groups d \( \$ 569.34 \) less \( \$ 123.85 \) d

Let's solve each part step by step by first rounding the amounts to the nearest dollar. ### a. Pens at \( \$ 4.27 \) each 1. Round \( 4.27 \) to the nearest dollar: - \( 4.27 \) rounds to \( 4 \). 2. If we assume we want to buy \( n \) pens, the total cost would be \( 4n \). ### b. The total of \( \$ 5.99, \$ 4.78 \), and \( \$ 12.09 \) 1. Round each amount: - \( 5.99 \) rounds to \( 6 \). - \( 4.78 \) rounds to \( 5 \). - \( 12.09 \) rounds to \( 12 \). 2. Calculate the total: \[ 6 + 5 + 12 = 23 \] ### c. \( \$ 56.67 \) divided into three equal groups 1. Round \( 56.67 \) to the nearest dollar: - \( 56.67 \) rounds to \( 57 \). 2. Divide by \( 3 \): \[ \frac{57}{3} = 19 \] ### d. \( \$ 569.34 \) less \( \$ 123.85 \) 1. Round each amount: - \( 569.34 \) rounds to \( 569 \). - \( 123.85 \) rounds to \( 124 \). 2. Calculate the difference: \[ 569 - 124 = 445 \] ### Summary of Estimates - a. Total cost of pens: \( 4n \) (depends on the number of pens) - b. Total of \( \$ 5.99, \$ 4.78, \) and \( \$ 12.09 \): \( 23 \) - c. \( \$ 56.67 \) divided into three equal groups: \( 19 \) - d. \( \$ 569.34 \) less \( \$ 123.85 \): \( 445 \)