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marty ans stewart are stuffing envelopes with index cards. they are putting x index cards in each envelope. when they are finished, marty has 15 stuffed envelopes and 4 extra index cards, tewart has 12 stuffed envelopes and 6 extra index cards. write an expression in standard of index cards the boys started with. explain what your expression means

The total number of cards is 27x +10

Step-by-step explanation:

Each envelope gets x index cards

Marty:

15 envelopes and 4 extra cards

15*x +4 = total index cards

Stewart:

12 envelopes and 6 extra cards

12*x +6 = total index cards

The total number of cards is the sum of the cards for each of the boys

15*x +4 + 12*x +6

27x +10

The total number of cards is 27x +10

just take the area of the square and then the area of the circle then subtract the circle area from the squares area

step-by-step explanation: