Evaluate the expression when x = 8:

Mathematics

1 answer:

Marysya12 [62]2 years ago

6 0

The value of the expression when x = 8 is 20

<h3>How to evaluate the expression when x = 8?</h3>

The expression is given as:

3x - 4

When x = 8, we have:

3x - 4 = 3 * 8 - 4

Evaluate the product

3x - 4 = 24 - 4

Evaluate the difference

3x - 4 = 20

Hence, the value of the expression when x = 8 is 20

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Can someone help me please

Masja [62]

Answer:

51ft, 17ft, 39ft

Step-by-step explanation:

longest = x

2nd = $\frac{1}{3}$ x

3rd = x - 12

P = 107

a + b + c = Perimeter

x + $\frac{1}{3}$ x + x - 12 = 107

$\frac{7}{3}$ x -12 = 107

$\frac{7}{3}$ x = 119

x = 51

$\frac{1}{3}$ x = 17

x - 12 = 39

7 0

3 years ago

17. Write the equation of a line that is perpendicular to the given line and that passes through the given point.

nataly862011 [7]

$\text{Let}\ k:y=m_1x+b_1\ \text{and}\ l:y=m_2x+b_2.\\\\l\ \perp\ k\iff m_1m_2=-1\to m_2=-\dfrac{1}{m_1}\\\\\text{We have the line in point-slope form:}\\\\y-y_1=m(x-x_1)\\\\m-slope\\\\y-2=\dfrac{7}{3}(x+5)\to m_1=\dfrac{7}{3}\\\\\text{therefore}\ m_2=-\dfrac{1}{\frac{7}{3}}=-\dfrac{3}{7}.\\\\\text{We have the slope}\ m=-\dfrac{3}{7}\ \text{and the point}\ (-4,\ 9).\ \text{Substitute:}\\\\y-9=-\dfrac{3}{7}(x-4))\\\\\boxed{y-9=-\dfrac{3}{7}(x+4)}$