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3 years ago

Please answer! (1) what mistake was made? (2) what suggestion could help avoid that?

Mathematics

1 answer:

AveGali [126]3 years ago

3 0

Answer:

1) the signs of the numbers is not in standard form

2) always make sure that the signs of the two equations is standarised and then solve

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Michelle just had a baby and needs to buy supplies from the store. She buys b bottles, d diapers, f formula, and p pacifiers. Th

gtnhenbr [62]

C is incorrect. 8f represents the cost of 8 formulas, not just the cost of one formula.

3 0

3 years ago

in the first year there are 35 participants in the third year there were 57 participants. how many participants are predicted fo

bearhunter [10]

79 because from year 1 to year 3 it went up by 22 so you can predict it will go up by another 22

8 0

4 years ago

QUICK!<br> A. –27<br> B. –3<br> C. 3<br> D. 27

Alex

Answer:

C. 3

Step-by-step explanation:

-9 * -1/3

= -9/ -3

A negative divided by a negative is a positive

9/3

7 0

3 years ago

Perform each indicated operation

MissTica

Answer: $\frac{x+6}{x-4}$

Step-by-step explanation:

First you need know some general formuals of factorization such as

$x^3+y^3=(x+y)(x^2-xy+y^2)$ so you have $x^3+64=X^3+4^3=(x+4)(x^2-4x+4^2)$

And, $x^2-y^2=(x-y)(x+y)$ so you have $2x^2-32=2(x^2-16)=2(x^2-4^2)=2(x+4)(x-4)$

If you use them, then you can modify your equations such as

$\frac{x^3+64}{2x^2-32}$ ÷ $\frac{x^2-4x+16}{2x+12}$ = $\frac{(x+4)(x^2-4x+4^2)}{2(x+4)(x-4)}$ ÷ $\frac{x^2-4x+16}{2(x+6)}$ = $\frac{(x+4)(x^2-4x+4^2)}{2(x+4)(x-4)} . \frac{2(x+6)}{{x^2-4x+16}} = \frac{1}{x-4}.\frac{x+6}{1}=\frac{x+6}{x-4}$

4 0

3 years ago

Mark bought 12 boxes of paper clips and 10 packages of index cards for a

Nata [24]

Answer:

paper clips = $1.85

index cards = $3.95

Step-by-step explanation:

Mark

12 paper clips = x

10 index cards = y

$61.70 total

Janice

15 paper clips = x

7 index cards = y

$55.40 total

12x + 10y = 61.70

15x + 7y = 55.40

*** you want to cancel out one of the letters

(12x + 10y = 61.70) * -7

(15x + 7y = 55.40) * 10

-84x -70y = -431.9

150x + 70y = 554.0

-84x -70y = -431.9

66x + 0 = 122.1

66x = 122.1

x = 122.1 ÷ 66

x = 1.85

plug it back in

15(1.85) + 7y = 55.40

27.75 + 7y = 55.40

7y = 55.40 - 27.75

7y = 27.65

y = 27.65 ÷ 7

y = 3.95

8 0

3 years ago