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2 years ago

HELP PLS!

Mathematics

2 answers:

Phantasy [73]2 years ago

7 0

Answer:

390 pennies that susan is holding

asambeis [7]2 years ago

7 0

Answer:

3/4x-280=x/2

-3/4x-280=x/2 find the common factor for 3/4x-280/1 which is 4 3/4x-280/1 3xby

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Dinner for a family of 3 at the local Italian Eatery came to $47.83 before tax. If the family wanted to tip their server 20%, ho

EastWind [94]

Answer:

$9.57

Step-by-step explanation:

47.83 x 20% = 9.57

5 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

What is the answer to this sum 5/6 of 120

ELEN [110]

100 is the correct answer

6 0

3 years ago

Helpppppppppppppppppppppppp

katovenus [111]

Answer:

The car gets 30 miles to the gallon. After the car has traveled 80 miles , 2 2/3 gallons have been consumed.

Step-by-step explanation:bro trust me

5 0

3 years ago

Estimates the sum of 1/2-1/3

VladimirAG [237]

<span>decimal: 0.166666667

fraction: 1/6

this is if you were asking the difference which is subtraction, you asked for the sum and the difference
</span>

8 0

4 years ago