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3 years ago

A variable expression cannot consist of numbers or operations A. True B. False SUBMIT

Mathematics

2 answers:

OLEGan [10]3 years ago

8 0

Answer:

it is False

Step-by-step explanation:

A variable is letter that represents in a equation or expression.

Ksivusya [100]3 years ago

6 0

False. A variable expression has operations, but no =. It also contains variables(it is literally in the name).

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hope it helps

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Tell whether the given number is a solution of each question. ( Must show work for credit)

guajiro [1.7K]

Answer/Step-by-step explanation:

1. $9 = 2a + 3$ ; 3

Let's solve for a.

$9 - 3 = 2a$ (subtraction property of equality)

$6 = 2a$

$\frac{6}{2} = a$ (division property of equality)

$3 = a$

$a = 3$

Therefore, 3 is a solution to 9 = 2a + 3

2. $5n - (-30) = 5$ ; 7

$5n + 30 = 5$ (- × - = +)

$5n = 5 - 30$ (Subtraction property of equality)

$5n = -25$

$\frac{5n}{5} = \frac{-25}{5}$ (division property of equality)

$n = -5$

Therefore, 7 is not a solution of $5n - (-30) = 5$

3. $4.4r - 2.8 = 1.6$ ; 1

$4.4r = 1.6 + 2.8$

$4.4r = 4.4$

$\frac{4.4r}{4.4} = \frac{4.4}{4.4}$

$r = 1$

Therefore, 1 is a solution of $4.4r - 2.8 = 1.6$ .

5 0

3 years ago

Your welcome. enjoy ur day :)

Nat2105 [25]

Thank you!!! enjoy yours

4 0

3 years ago

Read 2 more answers

Which theorem or postulate proves that △ABC and △DEF are similar?

yan [13]

Answer:

△ABC and △DEF are similar by SAS Similarity Theorem.

Option (C) is correct .

Step-by-step explanation:

Definition of SAS Similarity property

Two triangles are said to be similar by SAS Similarity property If two sides are proportional and one corresponding angle congruent .

In △ABC and △DEF

$\frac{ED}{AB}= \frac{7}{21}$

$\frac{ED}{AB}= \frac{1}{3}$

and

$\frac{EF}{BC}= \frac{11}{33}$

$\frac{EF}{BC}= \frac{1}{3}$

Thus

$\frac{ED}{AB}=\frac{EF}{BC}= \frac{1}{3}$

∠ABC = ∠DEF (As given in the figure )

Thus △ABC and △DEF are similar by SAS Similarity property .

7 0

3 years ago

Read 2 more answers

Martha made a purchase for $70.20 including 8% sales tax.<br> What was the total before tax?

Oduvanchick [21]

Answer:

64.58

Step-by-step explanation:

100%-8%=92%

70.20*92%=64.58

3 0

3 years ago

Find the missing side

lisabon 2012 [21]

Answer: 1) The missing length is 40. 2) The missing side is 30 .

Step-by-step explanation:

1) 9^2 + b^2 = 41^2

81 + b^2 = 1681

-81 -81

b^2 = 1600

b= 40

2) 24^2 + 18^2 = c^2

576 + 324 = c^2

900 =c^2

c= 30

5 0

3 years ago