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Vesna [10]
3 years ago
13

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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A painter spends 3 hours working on a painting. A sculptor spends 2 2/3 as long working on a sculpture. How long does the sculpt
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Dylan has a bank that sorts coins as they are dropped into it. A panel on the front displays the total number of coins inside as
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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

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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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Step-by-step explanation:

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