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Vilka [71]
3 years ago
8

12 + 3y = 21 Expression or Equation:

Mathematics
2 answers:
victus00 [196]3 years ago
5 0
It is an equation because it has an equal sign. Whereas an expression does not have an equal sign.
Tamiku [17]3 years ago
3 0

Answer:

equation

Step-by-step explanation:

12 + 3y = 21

-12. -12

__________

3y = 9

y = 3

You might be interested in
A textbook store sold a combined total of 332 history and chemistry textbooks in a week. The number of chemistry textbooks sold
xz_007 [3.2K]

Answer:

208 history books

124 chemistry books

Step-by-step explanation:

Let a = total number of books

b = number of history books

c = number of chemistry books

a = b + c

We know that a is equal to 332 and c = b - 84

Let's substitute this value to our equation and solve for b first. Now we get:

332 = b + ( b - 84)

332 = 2b - 84

332 + 84 = 2b

416 = 2b

b = 208

Now we can solve for c

332 = 208 + c

332 - 208 = c

c = 124

Now let's check

a = 332

b = 208

c = b - 84 = 208 - 84 = 124

7 0
3 years ago
Are all congruent rectangles similar?
shusha [124]

All congruent rectangles similar because comparable shapes are not always congruent.

Given that,

We have to find are all congruent rectangles similar.

We know that,

Each side's length and the angles that separate them match those of the other shape's corresponding sides and angles. Comparable shapes are not always congruent, whereas congruent shapes are always similar.

So,

Similar figures are not always congruent, whereas congruent figures are always similar. For similar figures, we simply take into account the shapes, however for congruent triangles, we take into account both the shapes and sizes of the figure.

Therefore, All congruent rectangles similar because comparable shapes are not always congruent.

To learn more about congruent visit: brainly.com/question/26044249

#SPJ4

5 0
2 years ago
78.2 times 10 to the fourth power in standard form
aivan3 [116]

you would move the decimal to the right four times giving you 782000

5 0
3 years ago
Pls help and answer the question in the photo
svp [43]

Answer:

Cam

Step-by-step explanation:

Cam first multiplied both sides by 3 which removed the fraction on the left. They then correctly added 5 to both sides to get x on its own.

Hope this helps!

3 0
3 years ago
Find -23 7/8+10 3/4.
elena55 [62]

Answer:

0.875 + 0.75 + 1.625

Step-by-step explanation:

or in fraction form, 1 5/8

8 0
3 years ago
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