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STALIN [3.7K]
4 years ago
12

Twenty more than a number is eighteen in an equation

Mathematics
1 answer:
postnew [5]4 years ago
7 0
"more" refers to addition
"a number" refers to a variable (x)

x + 20 = 18

x = -2
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Answer:

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Step-by-step explanation:

The formula for the area of a triangle is

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\begin{array}{ccc}A & = & \dfrac{1}{2}bh\\\\564 & = & \dfrac{1}{2}x(2x - 1)\\ \\1128 & = & x(2x - 1)\\& = & 2x^{2} - x\\2x^{2} - x - 1128 & = & 0\\(2x + 47)(x - 24) & = & 0\\2x + 47 = 0 &\qquad & x - 24 = 0\\2x = -47 & \qquad & x = \mathbf{24}\\x = -23.5 & \qquad & \\\end{array}

We reject the negative value, so x = 24 ft

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Check:

564 = ½ × 24 × 47

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OK

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3 years ago
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3 0
2 years ago
Read 2 more answers
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