What is the product of 3x(x^2+4)? 0 + 3x + 4 3+ 12 31 124

Mathematics

2 answers:

Elena-2011 [213]3 years ago

8 0

Answer: i honestly dont know this seems very complicated

Step-by-step explanation:

ASHA 777 [7]3 years ago

7 0

Answer:

3x^3+12x

Step-by-step explanation:

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Will mark brainliest if you help!!!!!

Katyanochek1 [597]

Answer:

.70

Step-by-step explanation:

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3 0

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?

$y = 2830+15300 \times 3.3 = 53320$