Which expression is equivalent to 21x+9-3x

2 answers:

4 0

You can simplify this expression by combining like terms. You can see that you can subtract 3x from 21x leaving us with (your answer): 18x + 9. You could also factor this to look like 9(2x + 1). Whichever one you prefer :))

lorasvet [3.4K]3 years ago

3 0

18x+9 is the correct answer

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10. What is the measure of angle C?<br> A. 25°<br> B. 30°<br> C. 60°<br> D. 75°

Reil [10]

Answer:

Step-by-step explanation:

x + 5 + 3x + C = 180 All triangles have 180 degrees.

4x + 5 + C = 180

But C must be equal to 3x. Notice the markings on the lets of the triangle.

4x + 5 + 3x = 180

7x + 5 = 180 Subtract 5 from both sides

7x = 180 - 5

7x = 175

x = 25

But angle C = 3x

C = 3*25

C = 75

8 0

3 years ago

Find the area for all of these numbers

qwelly [4]

answer : 29
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6 0

2 years ago

Read 2 more answers

Hey i need help! no stupid answers!

Ahat [919]

Your first equation would be:
65 + 3x - 10 + 2x = 180
Then simplify to get:
5x + 55 = 180
Subtract 55 from each side:
5x = 125
Now divide by 5 to find x:
x = 25

The measure of angle B = 65
The measure of angle C = 50

Hope this helps!! :)

8 0

3 years ago

Read 2 more answers

Iris made bracelets with string and beads. She used x centimeters of string to make 7 bracelets. She used 17.8 centimeters of st

iren [92.7K]

Answer:

124.6 centimeters

Step-by-step explanation:

7(17.8) = x

Simplify:

x = 124.6

3 0