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skelet666 [1.2K]
3 years ago
6

Which expression is equivalent to 9x - (x – 3)(x + 1) + 10x?

Mathematics
2 answers:
lutik1710 [3]3 years ago
3 0

Answer:

-x^2 + 21x + 3.

Step-by-step explanation:

9x - (x – 3)(x + 1) + 10x

= 19x - (x^2 - 2x - 3)

=  -x^2 + 2x + 19x + 3

= -x^2 + 21x + 3.

Elis [28]3 years ago
3 0

Answer:

9x - (x-3)(x+1) +10x

Solving (x-3)(x+1) first

it implies x(x+1) -3 (x+1)

              = x^2 + x - 3x -3

              = x^2 -2x - 3

return the result into the original question

it gives: 9x - ( x^2 -2x -3) +10x

            expand

9x - x^2 +2x+3+ 10x

collect the like terms

- x^2 +21x +3

Step-by-step explanation:

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Greg's daughter will have $533 in her piggy bank in a year

The money in the piggy bank would increase everyday by the amount put in it. There are seven days in a week. If he puts $0.75 everyday apart from on Sundays when we puts $5.75, the amount that would be in the piggy bank in a week is the sum of the money deposited each day.

Total amount in a week = total amount deposited from Monday to Saturday + amount deposited on Sunday

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The total amount Greg's daughter would have in a year is a function of the number of weeks in year and the total amount saved in a week

Total amount in a year = number of weeks in year x the total amount saved in a week

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$10.25 x 52 = $533

In order to determine how much Greg's daughter would have in a year, first determine how much she would have in a week. Multiply this amount by the number of weeks in a year

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I will answer this in English:

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