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3 years ago

Note there are more than one answers!

Mathematics

1 answer:

Ber [7]3 years ago

5 0

Answer:

-1/9, 1/9

Step-by-step explanation:

If we represent this with an equation, we get 3 + |-9x| = 4. Subtract 3 from both sides and we get |-9x| = 1. There are two solutions to this, 1/9 and -1/9, since they both multiply to a number whose absolute value is 1. (-9 * 1/9 = -1, 9 * 1/9 = 1. -1 has an absolute value of 1.)

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Evaluate the expression 2a + 3b + 6 when a=2 and b=4

Vitek1552 [10]

Answer:

22 or 4+12+6

Step-by-step explanation:

Since A is equal to 2, times 2 by 2 and get 4

Since B= 4 you times 3 by 4 and get 12

4+12 is 16

16 plus 6 is 22

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3 years ago

What is 2/3 divided by 5/6

sergeinik [125]

Step-by-step explanation:

$\frac{2}{3} \div \frac{5}{6} \\ {doing \: reciprocal \:} \\ \frac{2}{3} \times \frac{6}{5} \\ \frac{4}{5}$

Hope it will help :)

4 0

3 years ago

Read 2 more answers

objective: central limit theorem assumptions. the factor(s) to be considered when assessing if the central theorem holds is/are

Eddi Din [679]

Answer:

Sample size

Step-by-step explanation:

Central Limit Theorem states that population with mean and standard deviation and if the sample size is large then the distribution of sample mean will be will be normally distributed. The central limit theorem holds assumptions that the factors to be considered when assessing central limit theorem is sample size.

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

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3 years ago

What is the solution set of the compound inequality 3.5x - 10> -3 and 8x -9 <39

Eva8 [605]

I need to answer two questions in order to ask a question. sorry that i’m stupid and have no idea how to do this

5 0

3 years ago