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zmey [24]
3 years ago
13

How to solve -7(-3r+2)=3r-6

Mathematics
1 answer:
Ymorist [56]3 years ago
8 0

Step-by-step explanation:

-7(-3r+2)=3r-6

Distribute the - 7

21r-14=3r-6

Add 14

21r=3r+8

Subtract 3r

18r=8

Divide 18r by 8

2.25 should be the answer to r.

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PLEASE HELP MATH!! (BRAINLIEST + MORE) questions in picture!
klasskru [66]

Answer:

A) 2x*2 +6x -3x - 9= 2x*2 +3x -9

B) 2yx*2 +2yx +2y +3x*2 +3x +3

C) 36x*2 y +48yx +3xy*2 + 4y*2

D) 2x*3 - 4x*2 y + 3x -6y

7 0
2 years ago
Question 2(Multiple Choice Worth 5 points) (04.01)The Boardman family walked two over five of a mile in two over seven of an hou
Zolol [24]

Answer:

The unit rate in miles per hour = <em>1.4 miles/hr</em>

Step-by-step explanation:

Given that:

Distance walked by Boardman family = Two over five of a mile = \frac{2}{5}\ miles

Time taken by Boardman family = Two over seven of an hour = \frac{2}{7}\ hour

To find:

The unit rate in the miles per hour = ?

Solution:

Formula for the rate or the speed can be given as:

Speed = \dfrac{Distance}{Time}

Putting the values:

\Rightarrow \dfrac{\frac{2}5}{\frac{2}7}\\\Rightarrow \dfrac{7}{5}\\\Rightarrow \bold{1.4\ miles/hr}

So, the unit rate in miles per hour = <em>1.4 miles/hr</em>

4 0
3 years ago
Tell whether x and y show direct variation. Explain your reasoning. x=y+2
Mashutka [201]

Answer:

It does not show variation

Step-by-step explanation:

Given

x = y + 2

Required

Determine if there's direct variation between x and y

The general form of direct variation is:

y = kx

Make y the subject of formula in the given parameters;

x = y + 2

y = x - 2

Compare y = x - 2 to y = kx

<em>Since they are not of the same form, then the given equation do not show direct variation</em>

6 0
3 years ago
Line CD passes through points C(3, -5) and D(6, 0). What is the equation off three line CD in standard form?
Alina [70]
Standard form: Ax+By=C
first put in slope-intercept form:
slope = (0+5)/(6-3) = 5/3
pick point D: 0 = 5/3(6)+b -> b= -10
slope-intercept form: y=(5/3)x-10
multiply both sides by 3:
3y=5x-30
put in standard form:
5x-3y=30
8 0
3 years ago
Read 2 more answers
Suppose you have a mean standardized score of 1500 points with a standard deviation of 150 points. This data is normally distrib
Bond [772]

Answer:

z-score for 900 points = -4

Step-by-step explanation:

To find the z scores

z=(x-mean)/standard deviation

so

z=(900-1500)/150

z= -600/150

8 0
3 years ago
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