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Rudiy27
3 years ago
5

Which are the soultions of the quadratic equation? x^2=7x+4

Mathematics
1 answer:
Vesnalui [34]3 years ago
3 0

Answer:

Answer in image below

Step-by-step explanation:

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Simplify the following expression. -7x²-2+5x+13x² - 15x​
andreev551 [17]

Answer: 2(3x^2-5x-1) or 6x^2-10x-2

Step-by-step explanation: combine like terms, and then factor by grouping :)

8 0
9 months ago
The number in scientific notation is written as a decimal. 5.03x10^5
DiKsa [7]

Answer:

50,300,000,000

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Sean and Evan are college roommates who have part-time jobs as servers in restaurants. The distribution of Sean’s weekly income
Sauron [17]

Answer:

d. 0.303

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Subtraction between normal variables:

When two normal variables are subtracted, the mean is the difference of the means, while the standard deviation is the square root of the sum of the variances.

In this question:

We want the probability of Sean having a greater income than Evan, which is the probability of the subtraction of Sean's income by Evan's income is greater than 0.

Distribution of the difference between Sean's and Evan's income:

Sean has mean 225, Evan 240. So

\mu = 225 - 240 = -15

Sean's standard deviation is of 25, Evan's of 15. So

\sigma = \sqrt{25^2+15^2} = 29.15

Probability that Sean will have a greater income than Evan in a randomly selected week:

Probability of the subtraction being greater than 0, which is 1 subtracted by the pvalue of Z when X = 0. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{0 - (-15)}{29.15}

Z = 0.51

Z = 0.51 has a pvalue of 0.695

1 - 0.695 = 0.305.

Closest to 0.303, option d.

5 0
3 years ago
Find the value of 20 % of $300
adoni [48]

Answer:

$60

Step-by-step explanation:

multiply $300 by 20%

20% = \frac{20}{100} = 0.2, hence

20% of $300 = $300 × 0.2 = $60


8 0
2 years ago
Sarah has 8 3/4 cups of flour each batch takes 1 2/3 cups of flour which is the best answer for how many batches of sarah can ma
ad-work [718]

Answer:  d

Step-by-step explanation:because if look at the problem 8-1 is 7 and 3/4-2/3 is around 1 so it would be 6

3 0
2 years ago
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