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Sergeeva-Olga [200]
3 years ago
5

School x and school y play each other in a competition school x has 8 more points then school y school x has three times as many

as school y how many points does each school have
Mathematics
2 answers:
Nookie1986 [14]3 years ago
5 0
I think the anwser is team y has 4 points and team x has 12 points because 4×3=12-4=8 so team x has 3× the points team y does and has an 8 point lead.
hope this helps and dont forget to hit that heart :)
Andrej [43]3 years ago
5 0
X=y+8 => y=x-8
x=3y

2x = 4y + 8 /:2
x = 2y + 4
x = 2*(x-8) + 4
x = 2x - 16 + 4
x - 2x = -12
-x = -12
x = 12

y = x - 8
y = 12 - 8
y = 4

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7 0
2 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
2 years ago
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Your answer would be
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3 years ago
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Answer:

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Step-by-step explanation:

6 0
3 years ago
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