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3 years ago

Create a word problem using the following equation -2(5)= -10

2 answers:

7 0

Johnny has a gambling addiction. He goes to the casino every night and loses two dollars each time. If he goes 5 nights, how much money will Johnny lose?

My name is Ann [436]3 years ago

3 0

Jeremy has -2 points on his server. He earns 5 times as less as he had.

How much does Jeremy have now?

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The 20 to 34 age groups are approximately normally distributed with µ = 110

Savatey [412]

Answer:

21.94% of people aged 20 to 34 have IQs between 125 and 150.

Step-by-step explanation:

The complete question is: Scores on the Wechsler Adult Intelligence Scale (a standard IQ test) for the 20 to 34 age group are approximately Normally distributed with μ = 110 and σ = 25.

What percent of people aged 20 to 34 have IQs between 125 and 150?

Let X = Scores on the standard IQ test for the 20 to 34 age group

SO, X ~ Normal( $\mu=110,\sigma^{2} =25^{2}$ )

The z-score probability distribution for the normal distribution is given by;

Z = $\frac{X-\mu}{\sigma}$ ~ N(0,1)

where, $\mu$ = population mean = 110

$\sigma$ = standard deviation = 25

Now, the percent of people aged 20 to 34 have IQs between 125 and 150 is given by = P(125 < X < 150) = P(X < 150) - P(X $\leq$ 125)

P(X < 150) = P( $\frac{X-\mu}{\sigma}$ < $\frac{150-110}{25}$ ) = P(Z < 1.60) = 0.9452

P(X $\leq$ 125) = P( $\frac{X-\mu}{\sigma}$ $\leq$ $\frac{125-110}{25}$ ) = P(Z $\leq$ 0.60) = 0.7258

The above probability is calculated by looking at the value of x = 1.60 and x = 0.60 which has an area of 0.9452 and 0.7258.

Therefore, P(125 < X < 150) = 0.9452 - 0.7258 = 0.2194 or 21.94%

7 0

3 years ago

A cylinder has diameter of 4ft and a height of 9ft. Explain whether halving the diameter has the same effect on the surface area

elena55 [62]

Answer:

See Below

Step-by-step explanation:

The surface area of cylinder is given by the formula:

$SA=2\pi r^2 + 2\pi r h$

Where

r is radius ( diameter is 4, so radius is 4/2 = 2)

h is height ( h = 9)

Lets find original surface are:

$SA=2\pi r^2 + 2\pi r h\\SA=2\pi (2)^2 + 2\pi (2) (9)\\SA=8\pi +36\pi\\SA=44\pi$

Halving diameter:

diameter would be 4/2 = 2, so radius would be 2/2 = 1

So, SA would be:

$SA=2\pi r^2 + 2\pi r h\\SA=2\pi (1)^2 + 2\pi (1) (9)\\SA=2\pi +18\pi\\SA=20\pi$

Halving height:

Height is 9, halving would make it 9/2 = 4.5

Now, calculating new SA:

$SA=2\pi r^2 + 2\pi r h\\SA=2\pi (2)^2 + 2\pi (2) (4.5)\\SA=8\pi + 18\pi\\SA= 26\pi$

Original SA is $44\pi$ ,

Halving diameter makes it $20\pi$

Halving height makes it $26\pi$

So, halving diameter does not have same effect as halving height.

5 0

3 years ago

n a local election between candidate A and candidate B, candidate B got 35 votes, which is 125% as many votes as candidate A. If

kkurt [141]

Number of votes won by A = p
Number of votes won by B = 35

Number of votes won by B are 125% of the number of votes won by A. So we can write that 35 is 125% of p. In equation form we can translate it as:

35 = 125% of p
35 = 1.25 x p
p = 35/1.25
p = 28

So the number of votes won be A are 28.

5 0

3 years ago

Please answer this correctly I have to finish the sums by today

Naily [24]

Answer: i cant see it

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

What is the vertex of the graph of y = –x2

dolphi86 [110]

The parabola goes down(makes a sad face) because it is negative. The answer is 0,0