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2 years ago

You spin the spinner once. What is P ( not less than 7)? Write your answer as a fraction. Ex: 2/3 *

Mathematics

1 answer:

Dafna11 [192]2 years ago

6 0

Answer:

P(not less than 7) = 1/4

Step-by-step explanation:

As the spinner has 4 sectors.

We spin the spinner once.

Probability not less than 7 means the spinner mapping the number greater than 7.

Here, only 8 is the number which is not less than 7.

Therefore, P(not less than 7) = 1/4

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128.34 as a mixed number in simplest form

KonstantinChe [14]

128.34=12817/50 THAT IS THE ANSWER FOR THIS QUESTION

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3 years ago

Cara is a high school student. On average, there are 26 students per class at her school, with a standard deviation of 3 student

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Answer:

B. 97%

Step-by-step explanation:

20 students is -2 standard deviations away from the mean

35 is +3 standard deviations away from the mean

100 - 2.4 = 97.6

(2.4 is amount of data we are not using)

please refer to the standard deviation graph attached :)

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1 year ago

Which expression is eqivalent to 9a +12

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$3(3a + 4)$

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3 years ago

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Step-by-step explanation:

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2 years ago

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Train a is traveling at 30 mph faster than train b. If train a travels 350 miles in the same amount of time that train b travels

GalinKa [24]

Answer:

20 mph

Step-by-step explanation:

Let speed of Train a = Va mph

Let speed of Train b = Vb mph

Va = Vb + 30

Let time taken for Train a = Ta

Let time taken for Train b = Tb

time taken = distance travelled/speed

Ta = 350/Va = 350/(Vb+30)

Tb = 140/Vb

But they both travel in the same amount of time.

So, Ta = Tb

$\frac{350}{v_{b} + 30}=\frac{140}{v_{b}}$

Cross multiply

$350v_{b} = 140(v_{b} + 30)\\\\350v_{b} = 140v_{b} + 4200\\\\350v_{b} -140v_{b} = 4200\\\\210v_{b} = 4200$

Divide both sides by 210

$\frac{210v_{b} }{210} \frac{4200}{210} \\\\v_{b} = 20 mph$

4 0

2 years ago