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3 years ago

7

Find an equation of variation in which y varies directly as x and y=10 when x equals 0.5. Then find the value of Y when equals 1

9

1 answer:

Debora [2.8K]3 years ago

3 0

If x equals 19 then y would equal 380.

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Algebra:Can someone help I don’t know where I went wrong but my answer is wrong

evablogger [386]

Hey there!!

3 ( x - 6 ) + 15 = 4 ( x - 1 ) + 4

3x - 18 + 15 = 4x - 4 + 4

3x - 3 = 4x

- 3 = x

x = -3

The mistake is , you have written -4 + 4 = 8

- 4 + 4 = 0

and - 18 + 15 = - 3 ( not - 33 )

correct it, you will get it

Hope helps!

7 0

3 years ago

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There are 5 questions on a multiple choice exam, each with five possible answers. If a student guesses on all five questions, wh

Mrac [35]

Answer:

$20.5\%$

Step-by-step explanation:

Let's write out a case for two specific questions being correct and the rest being incorrect:

$\frac{1}{5}\cdot \frac{1}{5}\cdot \frac{4}{5}\cdot \frac{4}{5}\cdot \frac{4}{5}$ ,

The $\frac{1}{5}$ represents the chances of getting the question correct, as there are 5 answers and 1 correct answer choice.

The $\frac{4}{5}$ represents the chances of getting the question incorrect, as there are 5 answers and 4 incorrect answer choices.

The equation above does show the student getting two answers correct and three answers incorrect, but it only shows one possible case of doing so.

We can choose any two of the five questions to be the ones the student gets correct. Therefore, we need to multiply this equation by the number ways we can choose 2 from 5 (order doesn't matter): $\binom{5}{2}=10$ .

Therefore, the probability the student gets two questions correct is:

$\frac{1}{5}\cdot \frac{1}{5}\cdot \frac{4}{5}\cdot \frac{4}{5}\cdot \frac{4}{5}\cdot \binom{5}{2}=\frac{1}{5}\cdot \frac{1}{5}\cdot \frac{4}{5}\cdot \frac{4}{5}\cdot \frac{4}{5}\cdot 10=0.2048\approx \boxed{20.5\%}$

6 0

3 years ago

There are 4 more girls in Mrs. Pitt's class than Mr. Brown's class. Five girls moved from Mrs. Pitt's class to Mr. Brown's clas

mixer [17]

3 girls were in Mr. Brown class in the beginning

5 0

3 years ago

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helpppppppppppppppppppppppppppppppppppp meeeeeeeeeeeeeeeeeeeeeeeeee pleaseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

lorasvet [3.4K]

The answer is the third option.

m = 7.5h

The h value multiplied by 7.5 will give you the m value.

6 0

3 years ago

What is the value of 1/2 divide by 1/3?

Sloan [31]

Answer:

3/2

Step-by-step explanation:

1/2 ÷ 1/3

Keep - Change - Flip

Keep 1/2

Change ÷ to ×

Flip 1/3 to 3/1

1/2 × 3/1 = 1 · 3/2 · 1 = 3/2

6 0

3 years ago

Read 2 more answers