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marissa [1.9K]
2 years ago
14

Jamie had seven posters, but only 3 could fit on his closet door. How many different ways can he arrange the three posters out o

f the seven on his door?
A. 52.5
B. 210
C. 1260
D. 5040
Mathematics
1 answer:
Svetllana [295]2 years ago
8 0

Answer:

210 ways

Step-by-step explanation:

7 P 3 = 210  ways

or    7 C 3 = 35     choices of 3 posters which can bearrranged in 6 different ways     6 * 35 = 210 ways

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Help anyone<br> 8th grade math need it asap
Step2247 [10]

Answer:

The value of x = -13

Step-by-step explanation:

Given the expression

\frac{0.2x+1}{2}=-0.8

Multiply both sides by 2

\frac{2\left(0.2x+1\right)}{2}=2\left(-0.8\right)

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0.2x+1-1=-1.6-1

Simplify

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3 years ago
The equation of a line is y=-2x+1. What is the equation of the line that is parallel to the first line and passes through (2,2)?
Murrr4er [49]

Answer:

The equation in slope-intercept form is y=-2x+6.

The equation in standard form is 2x+y=6.

The equation in point-slope form is y-2=-2(x-2).

Step-by-step explanation:

The slope-intercept form of a line is y=mx+b where m is the slope and b is the y-intercept.

Parallel lines will have the same slope and different y-intercept.

Anyways the slope of y=-2x+1 is -2.

So the equation of our line we are looking for is -2.

So we know our equation is in the form y=-2x+b.

We must inf b using y=-2x+b with (x,y)=(2,2).

y=-2x  +b  with (x,y)=(2,2)

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2=-4+b

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2+4=b

Simplify:

6=b

The equation is y=-2x+6.

Now it didn't say what form it wanted.

There are some forms I can give you like standard and point-slope form.

There is also general form but it is not too much different from standard form.

Standard form is ax+by=c where a,b, and c are integers if possible.

Point-slope form is y-y1=m(x-x1) where (x1,y1) is a point on the line and m is the slope.

So let's go for standard form (ax+by=c) first:

y=-2x+6

add 2x on both sides:

2x+y=6

This is standard form because it is in the form

ax+by=c.

Ok we know point (2,2) is on our line and we also know we have slope,m, is -2.

Point-slope form is

y-y1=m(x-x1)

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The two lines graphed below are not parallel how many solutions are there to the system of equations
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