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2 years ago

12. Nine more than y is twenty one.

Mathematics

2 answers:

Pavel [41]2 years ago

6 0

Answer

y=12

Step-by-step explanation:

y+9=21 (this would be the formula)

-9 -9 (you want to eliminate 9 from the equation, so subtract it from both sides of the equation)

y=12 (after subtracting 9 from both sides you are left with 12)

Check it

12+9=21 (is this true?)

21=21 (yes it is true, therefore y=12)

Anettt [7]2 years ago

4 0

Answer:

y+9=21

Step-by-step explanation:

9 more than y equals 21.

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Answer:

3) 5

4) 8.2

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Step-by-step explanation:

From the attached triangle, using trigonometric ratio we can find ∠G as; tan^(-1) (6/8)

Thus, ∠G = 36.87°

Still using trigonometric ratios;

FG/8 = cos 36.87°

FG = 8 cos 36.87°

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3) EF + FG = EG

Since EG is 10, mean of EF and FG = 10/2 = 5

4) mean of EG and FG = (10 + 6.4)/2 = 8.2

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Thus; EF = EG - FG

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EF = 3.6

Mean of EG and EF = (10 + 3.6)/2 = 6.8

6) FG = 6.4

7) EF = 3.6

8) Using trigonometric ratio;

DF/8 = sin 36.87

DF = 8 × 0.6

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2 years ago

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Step-by-step explanation:

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Answers in order:

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2 years ago

12. Nine more than y is twenty one.​

12. Nine more than y is twenty one.