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3 years ago

7

Return to the original problem. PEMDAS says to multiply before adding. But could you have performed a different operation and st

ill have gotten a correct answer? Which one? Explain.
(4x2 + 8x + 15) + (x2 − x − 27) − (x + 5)(x − 7)

1 answer:

Brrunno [24]3 years ago

3 0

Answer:

no

Step-by-step explanation:

Because PEMDAS is something you MUST follow no matter WHAT!!!!!!!!

Period pooo

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Determine the intercepts of the line.

sergey [27]

Answer:

y-intercept: (0, 5/2)

x-intercept: (5/3, 0)

Step-by-step explanation:

The y-intercept is found by setting x=0 and dividing by the coefficient of y.

0 +2y = 5

y = 5/2

The x-intercept is found by setting y=0 and dividing by the coefficient of x.

3x +0 = 5

x = 5/3

The intercepts are ...

y-intercept: (0, 5/2)

x-intercept: (5/3, 0)

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2 years ago

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Petra jogs 5 miles in 40 minutes. At this rate, how long would it take her to jog 7 miles?

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(40 min)/(5 mi) = (time)/(7 mi) . . . . . the rates are the same
(7/5)*(40 min) = time = 56 min

At the same rate, it would take Petra 56 minutes to jog 7 miles.

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3 years ago

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

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3 years ago

Explain What Happens To The Volume Of A Sphere When

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A. The volume is 8 times more
b. The volume is 27 times more
c. The volume is 64 times more

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klasskru [66]

Answer:

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