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3 years ago

Solve the equations 3x + 5y = 21 -20x + 5y show your work

Mathematics

1 answer:

Digiron [165]3 years ago

8 0

Answer:

x=21/23

Step-by-step explanation:

Solve for x:

3x+5y=21−20x+5y

Add 20x to both sides:

3x+5y+20x=−20x+5y+21+20x

23x+5y=5y+21

Subtract 5y to both sides:

23x+5y+−5y=5y+21+−5y

23x=21

Divide both sides by 23:

x=21/23

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Determine whether 7^2m · 6^2m is equivalent to each of the following expressions:

KiRa [710]

Answer:

Not equivalent to any of the options

Step-by-step explanation:

Given:

7^2m * 6^2m

Since, they both have different bases, multiply the bases and add the powers

7^2m * 6^2m

= (7 * 6)^(2m + 2m)

= 42^4m

Therefore,

7^2m * 6^2m is equivalent to 42^4m

A. 42^6m

Not equivalent

B. 42^m

Not equivalent

C. 42^9m

Not equivalent

6 0

3 years ago

Factor Completely 192x^3 + 375

erastovalidia [21]

192 $x^{3}$ +375

Factor out common term 3:
3(64 $x^{3}$ +125)

Next, factor 64 $x^{3}$ +125:
Apply the sum of cubes rule:
$x^{3}$ + $y^{3}$ =(x+y)( $x^{2}$ -xy+ $y^{2}$ )

64 $x^{3}$ +125 = (4x+5)( $4^{2}$ $x^{2}$ -4*5x+ $5^{2}$ )

Refine to receive the simplified answer:
3(4x+5)( $4^{2}$ $x^{2}$ -4*5x+ $5^{2}$ )
3(4x+5)(16 $x^{2}$ -20x+25)

8 0

4 years ago

Read 2 more answers

How do you solve this problem?

belka [17]

Answer:

You solve this problem

Step-by-step explanation:

Fire and sun light

4 0

3 years ago

Simplify the following expressions -18x2+3x-2x2+5 the first 2 is a small and the third 2 is small