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2 years ago

11

Graph f(x)=4x calculate the initial value of the function

1 answer:

tekilochka [14]2 years ago

4 0

Answer:

Step-by-step explanation: your going to find the y intercept

find the domain

find the inverse

find the derivative

find the extrema

find the horizontal asymptotes

tell weather its even or odd

but its X=0

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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

2 years ago

A tourist first walked 17km with a speed of v km/h. Then he hiked 12 km uphill with the speed that was 2 km/hour less than his o

ExtremeBDS [4]

Answer: $t=\frac{17}{v}+\frac{12}{v-2}$

Step-by-step explanation:

Given: A tourist first walked 17km with a speed of v km/h.

Since $Speed=\frac{distance}{time}$

therefore, $Time=\frac{distance}{speed}$

Let $t_1$ be the time he walked with speed v.

then $t_1=\frac{17}{v}$

Also he hiked 12 km uphill with the speed that was 2 km/hour less than his original speed.

Let $t_2$ be the time he hiked 12 km,

Then $t_2=\frac{12}{v-2}$

The total time for the whole trip is given by:-

$t=t_1+t_2=$

Substitute the values of $t_1$ and $t_2$ in the equation, we get

$t=\frac{17}{v}+\frac{12}{v-2}$

4 0

3 years ago

A baseball pitcher won 80% of the games he pitched. If he pitched 35 ballgames, how many games did he win?

Marina CMI [18]

Answer:

The answer is 28%

Step-by-step explanation:

You multiply them.

7 0

3 years ago

Read 2 more answers

I need help with this please hurry it's timed

rodikova [14]

Answer:

I think B 82.3%

Step-by-step explanation:

4 0

2 years ago

Which expression is equivalent to 3 + 3/8 − 1/2 ?

andreyandreev [35.5K]

Answer:

2 and 7/8

Step-by-step explanation:

3 + 3/8 - 1/2

3 + 3/8 - 4/8

3 - 1/8

2 and 7/8

5 0

2 years ago