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2 years ago

Find the value of x in the equation 13 - X =21

Mathematics

2 answers:

SOVA2 [1]2 years ago

8 0

Answer:

- 8

Step-by-step explanation:

13 - x = 21

-x = 8 Subtract 13 from both sides

x = -8 Divide both sides of -1 since x still has a negative.

gizmo_the_mogwai [7]2 years ago

3 0

Answer:

x=-9

Step-by-step explanation:

$13-x=21\\\\12-x+x=21+x\\\\12+0=21+x\\\\21+x=12\\\\21-21+x=12-21\\\\0+x=-9\\\\x=-9$

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3 years ago

I need help on Part B and C on question 2

kap26 [50]

Answer:

The answer to your question is

Part A. Archimedes grades 6 1/4 tests per day

Part B. 8 19/32 days

Part C. 6 26/29 days

Step-by-step explanation:

Part A

Total time = 6 2/5 days

Number of tests = 40 tests

Process

1.- Convert the mixed fraction to improper fraction

6 2/5 = (30 + 2) / 5 = 32/5

2.- Divide 40 by 32/5

40/1 / 32/5 = (40 x 5) / (32 x 1)

= 200 / 32

Simplify

100 / 16 = 50/8 = 25/4

3.- Convert 25/4 to mixed fractions

4 25

25/4 = 6 1/4

Archimedes grade 6 1/4 tests per day

Part B

15 more tests

Total time = 32/5

Total tests = 40 + 15 = 55

Process

1.- Divide 55 by 32/5

55 / 1 / 32 /5 = (55 x 5) / (32 x 1)

= 275 / 32

2.- Convert 275/32 to a mixed fraction

32 275

256

Result 8 19/32 days

Part C

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50 / 7.25 = 5000 / 725

725 5000

- 4350

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2 years ago

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Step-by-step explanation:

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Hope my answer helps you out :D

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Answer:

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Step-by-step explanation:

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