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Georgia [21]
3 years ago
6

Verify the property: a x ( b + c ) = a x b + a x c by taking a = −5 /2,b= 11/8​

Mathematics
1 answer:
soldi70 [24.7K]3 years ago
4 0

Answer:

True

Step-by-step explanation:

a x ( b + c ) = a x b + a x c  Substitute

-5 x ( 11/8 + c ) = -5 x 11/8 + -5 x c

-5 ( c + 11/8) = - 5c - 55/8

- 5c - 55/8 = - 5c - 55/8

True

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A rectangle has vertices located at (–4, 4), (2, 4), (2, –4) and (–4, –4). What is the length of a diagonal of the rectangle?
Allisa [31]

Answer:

A diagonal of this rectangle has length 10.

Step-by-step explanation:

The vertices (-4, 4) and (-4, -4) have the same x-coordinate (-4) and different y-coordinates (4 and -4).  These two points are the endpoints of a vertical side of the rectangle which has length 4 - (-4) = 8.

Similarly, the vertices (2, -4) and (-4, -4) have the same y-coordinate (-4) but different x-coordinates (2 and -4).  To find the horizontal dimension of the rectangle, we calculate 2 - (-4), which comes out to 6.

Thus, the width of the rectangle is 6 and the length is 8.

Using the Pythagorean Theorem, we find the length of a diagonal as follows:

d = √(6^2 + 8^2) = √(36 + 64) = √100 = 10.

A diagonal of this rectangle has length 10.

5 0
3 years ago
Determine for what values of x and y are the following equalities always true.
Agata [3.3K]
(k+1)x-(2k+3)y-3k-5=0
kx + x - 2ky - 3y - 3k - 5 = 0
(x - 2y) k + (x - 3y) = 3k + 5

therefore
x - 2y = 3
x - 3y = 5

Subtract 2 equations
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3 0
3 years ago
Solve the system of linear equations by substitution.<br><br> 5x+2y=9<br><br> x+y=-3
Hatshy [7]
Step 1: subtract x from -3. New equation should be y=-3-x.
Step 2: plug that equation into top equation. Should be 5x + 2(-3-x) = 9.
Step 3: use distribitive properties on 2(-3-x). New equation is 5x - 6 - 2x = 9.
Step 4: combine like terms. New equation 3x - 6 = 9.
Step 5: work it out. Divide 3x and 9 by 3. New equation is x - 6 = 3. Add 6 to -6 and 9. Final eqaution is x = 9.
Step 6: swap 9 for x in second equation. New equation is 9 + y = -3
Step 7: subtract 9 from 9 and -3. New equation is y = -12
: = = -
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3 years ago
Which equation represents the total commission (c) a sales associate receives if he sells 15 laptop computers (l)? What is the t
Leto [7]

Answer : C

the total commission (c) a sales associate receives if he sells 15 laptop computers (l)

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Total commission is c

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So c= 15l

the commission for selling each computer is $39.95

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Use the given conditions to write an equation for the line in​ point-slope form and in​ general form.
Paha777 [63]
First, simplify the equation given into slope intercept form.

slope intercept form is y = mx + b, where b is the y intercept and m is the slope.

3x - 2y - 5 = 0

I would move the 2y to the other side.

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So there's your slope intercept form.

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Where those with a subscript of 1 are part of the same point.

So you already known one point; -8, 8. I'll just do that as the pair with subscript 1. You know the slope as well from the slope intercept form; 3/2.

You can just plug those in. 

y - 8 = 3/2 (x + 8)

Now to change this to general form.

First, distribute 3/2 to x and 8.

y - 8 = 3/2x + 12
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Since there are no fractions, multiply everything by 2.

-3x + 2y - 40 = 0
6 0
3 years ago
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