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2 years ago

At practice, Diego does twice as many push-ups as Noah, and also 40 jumping jacks. He does 62 exercises in total.

Mathematics

2 answers:

geniusboy [140]2 years ago

6 0

Answer:

the number of pushups done by Noah

Step-by-step explanation:

if Noah did x amount of pushups then Diego did twice as many, which is 2x therefore in this equation x represents the number of pushups done by Noah

IRINA_888 [86]2 years ago

4 0

Answer:

Step-by-step explanation:

x = number of pushups he did

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3 years ago

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In a study of wait times at an amusement park, the most popular roller coaster has a mean wait time of 17.4 minutes with a stand

Ann [662]

Answer: A: 0.0031

Step-by-step explanation:

Given : In a study of wait times at an amusement park, the most popular roller coaster has a mean wait time of 17.4 minutes with a standard deviation of 5.2 minutes.

i.e. $\mu=17.4$ and $\sigma=5.2$

We assume that the wait times are normally distributed.

samples size : n= 30

Let x denotes the sample mean wait time.

Then, the probability that the mean wait time is greater than 20 minutes will be :

$P(x>20)=1-P(x\leq20)\\\\=1-P(\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}\leq\dfrac{20-17.4}{\dfrac{5.2}{\sqrt{30}}})\\\\=1-P(z\leq2.74)\ \ [\because\ z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}]\\\\=1-0.9969\ \ [\text{ By z table}]\\\\=0.0031$

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Thus , the correct answer is A: 0.0031 .

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2 years ago

a kid wants to buy a book but it is 18$ the book is diconted to 15 % off but she still has to pay 6% taxes how much dose she pay

baherus [9]

Discounted at 15% off....means the kid actually paid 85%

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3 years ago

The curved surface area of cylinder is 108πcentimeter square and radius 3cm. find the height of cylinder.

bazaltina [42]

Answer:

Height= 18cm

Step-by-step explanation:

Curved surface area = 2πrh

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108π = 6πh

h= 108π ÷ 6π

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