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3 years ago

Can somebody help me with number 7? Please explain as well! :)

Mathematics

1 answer:

gayaneshka [121]3 years ago

4 0

To factor number 7 :
3x^2-12
3x^2+3×-4
3*1, -4:2*-2
3(x^2-2^2)
use difference of square formula ((a^2+b^2=(a+b)(a-b))
3(x+2)(x-2)

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Answer:

$\dfrac{100}{3 \times 5}$

Step-by-step explanation:

$\dfrac{100}{3 \times 5}$

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Answer:

1). System of equations- D + Q = 90 and D + 2.5Q = 175.50

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Step-by-step explanation:

Dylan has a bank that sorts coins as they are dropped in it.

A panel shows the total number of coins inside as well as the total value of these coins.

Let the number of dimes in the bank = D

and the number of quarters in the bank = Q

If the panel shows total number of coins = 90

Then the equation will be

D + Q = 90 -------(1)

And the panel displays the amount of the coins = $17.55

Then equation will be

0.10D + 0.25Q = 17.55 [1 Dime = $0.10 and 1 quarter = $0.25]

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Now we subtract equation (1) form equation (2)

D + 2.5Q - (D + Q) = 175.50 - 90

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1.5Q = 85.5

Q = $\frac{85.5}{1.5}$

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By putting Q = 57 in the equation (1)

D + 57 = 90

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