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3 years ago

Andycycles7kilometersduringeachtriptowork. HowmanytripswillAndyhavetomaketocycleatotalof21kilometers?

Mathematics

1 answer:

Pie3 years ago

6 0

Andy would have to make 3 trips in order to cycle 21 kilometers.

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I need help plsssd it’s algebra

nalin [4]

I would say B

Hope I helped :)

8 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?

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

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 = $r^2 = (0.72)^2 =0.5184$

8 0

3 years ago

Simplify (2/9)^3 A. 8/729 B. 6/9 C. 2/729 D. 8/9 No guessing please

Lunna [17]

Eliminate the exponent
2^3=8
9^3=729

The simplified answer would be 8/729.

Hope this helps!

7 0

3 years ago

Which equation represents a line that passes through (-2, 4) and has a slope of 2/5?

pashok25 [27]

Answer:y - 4 = 2/5(x + 2)

Step-by-step explanation:

Mark me brainliest

4 0

2 years ago

Is there an ordered pair that is a solution to BOTH of

Korolek [52]

Answer:

y = -1/2 x + 6

Step-by-step explanation:

2x + 4y = 24

4y = -2x + 24

divide each expression by 4

y = - 1/2x + 6

8 0

2 years ago