2 years ago

Simplify: 3(r + 12r^2) – 2(r + 8)

Mathematics

2 answers:

Morgarella [4.7K]2 years ago

8 0

Answer:

36r^2+r-16

Step-by-step explanation:

i did it

Olegator [25]2 years ago

7 0

Answer:

36r^2+r−16

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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3 years ago

The mean height of 10 girls is 154cm. The mean height of 8 boys is 162cm. What is the mean height of the class?

olganol [36]

Answer:

158cm

Step-by-step explanation:

154+162=316

316/2=158

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3 years ago

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Answer:

Step-by-step explanation:

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3 years ago

Work out the gradient of the line joining the points (2, 3) and (5,7)

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Answer:

The gradient of the line joining the points $P(x,y) = (2,3)$ and $Q(x,y) = (5,7)$ is $\frac{4}{3}$ .

Step-by-step explanation:

The gradient of the line joining two distinct point on a plane is represented by the slope of a secant line ( $m_{PQ}$ ), that is:

$m_{PQ} = \frac{y_{Q}-y_{P}}{x_{Q}-x_{P}}$ (1)

If we know that $P(x,y) = (2,3)$ and $Q(x,y) = (5,7)$ , then the gradient of the line is:

$m_{PQ} = \frac{7-3}{5-2}$

$m_{PQ} = \frac{4}{3}$

The gradient of the line joining the points $P(x,y) = (2,3)$ and $Q(x,y) = (5,7)$ is $\frac{4}{3}$ .

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$\angle FHD=74^{\circ}$ (alternate segment theorem)

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2 years ago