Antonio buys 4 notebooks for 350 each at a store The next da

Antonio buys 4 notebooks for $3.50 each at a store. The next day he returns to the store and exchanges the notebooks for 3 notebooks that have gone on sale for $1.75 each. Antonio uses the following expression to calculate the amount of money he should receive back from the exchange. (4 times $3.50)-(3 times $1.75) Which of the following expressions could Antonio have also used? $3.50 - $1.75 3($3.50 - $1.75) + $3.50 (4 times $3.50) - $1.75 (4 times 3) - ($3.50 times $1.75) 12 - ($3.50 + $1.75)

Solution

expresion which antonio used to calculate the money he will get after exchange is:

4($3.50)-3($1.75)

he can write 4($3.50) as 3($3.50)+$3.50

when we replace it in our expression:

3(%3.50)+%3.50-3($1.75)

we can rearrange it:

3($3.50)-3($1.75)+$3.50

now taking 3 common from first and second term:

3($3.50-$1.75)+$3.50

So,

B is the answer