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shepuryov [24]
3 years ago
9

38=2a+54 solve equation check your answer

Mathematics
1 answer:
alexgriva [62]3 years ago
4 0

Answer:

a=-8

Step-by-step explanation:

38=2a+54

2a+54=38

2a+54-54=38-54

2a=-16

2a/2=-16/2

a=-8

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gabriella rents bikes for $13 plus $7 per hour. Eduardo paid $27 to rent a bike for how many hours did he rent the bike?
e-lub [12.9K]

He has it for 2 hours

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2 years ago
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For women aged 19-24, systolic blood pressures (in mm Hg) are normally distributed with a mean of 114.8 and a standard deviation
Mrac [35]

Answer: p = 0.00714

Step-by-step explanation:

Since the population standard deviation of the distribution is known, the z test ( which produces the z score) is the perfect test for finding the probability of the data set in the question.

From the question,

Population mean (u) = 114.8

Sample mean (x) = 121.5

Population standard deviation (σ) = 13.1

Sample size (n) = 23

The z score formulae is given below as

Z = x - u/σ/√n

Z = 121.5 - 114.8/(13.1/√23)

Z = 6.7/(13.1/√23)

Z = 6.7/2.731

Z = 2.45.

The question is interested in knowing the probability of mean systolic blood pressure greater than 121.5.

This implies that we are looking for the probability at which our z score is greater than 2.45: P(z>2.45)

The z score (z=2.45) has divided the distribution into two regions, z< 2.45 ( area to the left of the distribution) and z>2.45 ( area to the right of distribution).

Hence, p(z>2.45) + p(z<2.45) = 1

To get a the probability, we have to use a standard normal distribution table.

The table we have here gives probability of the distribution to the left ( that's area towards the left), hence we need to find p(z<2.45) first

From the table p(z<2.45) = 0.99286

But p(z>2.45) = 1 - p(z<2.45)

p(z>2.45) = 1 - 0.99286

p(z>2.45) = 0.00714

8 0
3 years ago
Which should come next at the end of this series of numbers: 1, 2, 0, 3, -1?
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3 0
3 years ago
What the ratio of 7:3
Charra [1.4K]

Hey there!

<h2>ANSWER: 14/6</h2><h2>EXPLANATION:</h2>

Ratio of 7:3

If you want to get the ratio, you should multiply the numerator(7) and denominator(3) by 2.

7*2=14(Numerator)\\3*2=6(Denominator

So your answer is:

14/6(ANSWER)

Hope this helps!

-TestedHyperr

4 0
3 years ago
Tim answered all the questions on his math test but got 101010 answers wrong. He received 444 points for every correct answer, a
3241004551 [841]

Answer:

Step-by-step explanation:

Let x represent the number of questions that Tim got right in the math test.

The number of questions that Tim got wrong in the math test is 10.

If the total number of questions on the math test is q, it means that

x + 10 = q

If he received 4 points for every correct answer and there was no penalty for wrong answers, it means that he received 0 point for a wrong answer. If

his score was 76 points, it means that

4x + 0 × 10 = 76

4x = 76

Therefore, the required equations are

x + 10 = q

4x = 76

6 0
2 years ago
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