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salantis [7]
3 years ago
12

Can someone help with either of these questions

Mathematics
2 answers:
spayn [35]3 years ago
8 0

4.

\frac{5(14-2)^{2}}{2}

By the order of operations (parentheses, exponents, multiplication, division, addition, subtraction), we must get rid of the parentheses first.

Subtract 2 from 14.

\frac{5*12^{2}}{2}

Next is exponents. Square 12.

\frac{5*144}{2}

Multiply.

\frac{720}{2}

Divide.

Answer: 360

5.

<em>u</em> + <em>xy</em> if <em>u</em> = 18, <em>x </em>= 10, and <em>y</em> = 8

Substitute.

<em>u</em> + <em>xy</em>

18 + 10(8)

Multiply.

18 + 80

Add.

98

Answer: 98

Ray Of Light [21]3 years ago
7 0

5(14 - 2)^2 / 2

= 5*12^2 / 2

= 5 * 144 / 2

= 5 * 72

= 360 answer

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\large\boxed{D.\ -\dfrac{1}{3}}

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\text{Let}\ k:y=m_1x+b_1\ \text{and}\ l:y=m_2x+b_2,\ \text{then}\\\\l\ ||\ k\iff m_2=m_1\\\\l\ \perp\ k\iff m_1m_2=-1\to m_2=-\dfrac{1}{m_1}\\-------------------\\\\\text{We have the slope of given line a:}\ m_1=3.\ \text{Therefore the slope of a line b}\\\text{perpendicular to a is: }\\\\m_2=-\dfrac{1}{m_1}\to m_2=-\dfrac{1}{3}

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