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Crank
4 years ago
11

Evaluate 7x2x7x5 using properties of numbers. name the properties used in each step

Mathematics
1 answer:
gregori [183]4 years ago
4 0

Answer:

490

Step-by-step explanation:

7x2=14

7x5=35

14x35=490

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Step-by-step explanation:

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The points , (−15,1) and , (−7,r) lie on a line with slope 5/4. Find the missing coordinate r. Click image to enlarge
Nadya [2.5K]

The missing coordinate r is 11.

Solution:

Given points are (–15, 1) and (–7, r).

x_{1}=-15, x_{2}=-7, y_{1}=1 \text { and } y_{2}=7

Slope (m) = \frac{5}{4}

<u>To find the missing coordinate r:</u>

Slope formula:

$m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}$

Substitute the given values in the formula.

$\frac{5}{4}=\frac{r-1}{-7-(-15)}

$\frac{5}{4}=\frac{r-1}{-7+15}

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Do cross multiplication.

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Add 4 on both side of the equation.

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Divide by 4 on both side of the equation.

11 = r

⇒ r = 11

Hence the missing coordinate r is 11.

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Answer:

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Step-by-step explanation:

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