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3 years ago

Consider the equation n2+5=21.

Mathematics

1 answer:

lesya692 [45]3 years ago

6 0

Step-by-step explanation:

n2+5=21

n2 =21-5

n2 = 16

n =16/2=8

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What is a mathematical expression indicating to a root of a quantity?

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3 years ago

A college job placement office collected data about students’ GPAs and the salaries they earned in their first jobs after gradua

frez [133]

Answer:

X is the GPA

Y is the Salary

Standard deviation of X is 0.4

Standard deviation of Y is 8500

E(X)=2.9

E(Y)=47200

We are given that The correlation between the two variables was r = 0.72

a) $y = a+bx$

$b = \frac{\sum(x_i-\bar{x})(y_i-\bar{y})}{\sum(x_i-\bar{x})^2} = \frac{r \times \sqrt{var(X) \times Var(Y)}}{Var(X)} = \frac{0.72 \times \sqrt{0.4^2 \times 8500^2}}{0.4^2} = 15300$

$a=y-bx = 47200-(15300 \times 29) = 2830$

So, slope = 15300

Intercept = 2830

So, equation : $y = 2830+15300x$

b) Your brother just graduated from that college with a GPA of 3.30. He tells you that based on this model the residual for his pay is -$1880. What salary is he earning?

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Observed salary = Residual + predicted = -1860+53320 = 51440

c)) What proportion of the variation in salaries is explained by variation in GPA?

The proportion of the variation in salaries is explained by variation in GPA = $r^2 = (0.72)^2 =0.5184$

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2 years ago

Name the binomial you can multiply by (x + 9) to get the product x2 + 5x - 36.

Mrac [35]

The answer is: [C]: " (x - 4) " .
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" (x+9)(x-4) = x² - 4x + 9x - 36 = x² + 5x - 36 " .
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3 years ago

Read 2 more answers

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BabaBlast [244]

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3 years ago

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Answer:

y=3x+-6

Step-by-step explanation:

plug it into y=mx+b form

hope this helps

mark brainiest pls

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2 years ago