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3 years ago

6

The middle 68% of the scores fall between 80 and 90. What is the mean?

1 answer:

kolezko [41]3 years ago

6 0

It means 68% of all the final scores went in bewtween 80 and 90 percent

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Marlena spends a total of $58 at the Barnes and Noble. She purchases 4 books of equal price and spends an additional $4 on sales

Natalka [10]

Answer:

4b + 4 = 58

Step-by-step explanation:

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3 years ago

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cylinder a has a radius of 2 inches and a height of 2 inches. cylinder b has a radius of 2 inches and a height of 4 inches. calc

Step2247 [10]

Surface area of cylinder = 2πrh + 2πr^2

SA for cylinder A = 2π x 2 x 2 + 2π x (2)^2 = 8π + 8π = 16π
SA for cylinder B = 2π x 2 x 4 + 2π x (2)^2 = 16π + 8π = 24π

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3 years ago

Andrew bought 3 baseball cards for $240. After a few months, he got an offer from his friend Jack to buy the first card for doub

Dominik [7]

First we define variables:
x = first card original value
y = second card original value
z = third card original value
We write the system of equations:
Andrew bought 3 baseball cards for $ 240:
x + y + z = 240
the first card (at its original value) along with the second card (at its original price) and got $ 320:
2x + y = 320
the first card (at its original value) card along with the third card (at its original price) would have only got him $ 280:
2x + z = 280
Solving the system we have:
x = 120
y = 80
z = 40
Answer:
The original prices for each of the 3 baseball cards is:
(120, 80, 40)

8 0

3 years ago

HELP PLEASE<br><br> (-4)-(-2)-{(-5)-[(-7)+(-3)-(-8)]}

zaharov [31]

Answer:

answer is 1

Step-by-step explanation:

8 0

3 years ago

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“write an inequality to represent the graph.”

zhuklara [117]

Answer:

The inequality for the given graph is $y>\frac{2}{3}x-1$ .

Step-by-step explanation:

From the given graph it noticed that the line passing through (0,-1) and (3,1).

The equation of line passing through two points is defined as

$y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)$

The equation of line is

$y+1=\frac{1+1}{3-0}(x-0)$

$y+1=\frac{2}{3}x$

$y=\frac{2}{3}x-1$

Therefore the related equation is $y=\frac{2}{3}x-1$ .

The point (0,0) lies in the shaded region, therefore the point (0,0) is the solution of required inequality.

Put (0,0) in the related equation.

$0=\frac{2}{3}(0)-1$

$0=-1$

Since 0 is greater than -1, therefore the sign of inequality must be >. The related line is a dotted line, therefore we cannot use $\geq$ .

Therefore the required inequality is

$y>\frac{2}{3}x-1$

8 0

3 years ago