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3 years ago

In a class of 32 students

Mathematics

1 answer:

topjm [15]3 years ago

5 0

Answer:

1.48 m

Step-by-step explanation:

mean is calculated as

mean = $\frac{sum}{count}$

Then the sum for the 14 boys is

$\frac{sum}{14}$ = 1.56 ( multiply both sides by 14 )

sum = 21.84 m

The sum for the class of 32 is

$\frac{sum}{32}$ = 1.515 ( multiply both sides by 32 )

sum = 48.48 m

Thus the sum for the 18 girls is

sum = 48.48 - 21.84 = 26.64 m

Then mean height of girls is

mean = $\frac{26.64}{18}$ = 1.48 m

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The kinetic energy, k, the amount of energy that a moving object has, can be found for a particular roller coaster by the radica

alisha [4.7K]

The kinetic energy of the roller coaster is 2000Joules

Given the formula for expressing the velocity of the roller coaster is given as:

$v = \sqrt{\frac{2k}{1000} }$

Given the following parameter:

v = 10m/s

Substitute the given parameter into the formula to have:

$10 = \sqrt{\frac{2k}{1000} }$

Square both sides of the equation:

$(10)^2=(\frac{2k}{1000} )^2\\100=\frac{4k^2}{1,000,000} \\4k^2=100,000.000\\k^2=\frac{100,000,000}{4} \\k^2=4,000,000\\k=2000Joules$

Hence the kinetic energy of the roller coaster is 2000Joules

Learn more on subject of formula here: brainly.com/question/657646

3 0

3 years ago

There are 12 students in a classroom, including the triplets Joey, Chloe, and Zoe. If 3 of the 12 are randomly selected to give

lesya692 [45]

we know that

The probability of an event is the ratio of the size of the event space to the size of the sample space.

The size of the sample space is the total number of possible outcomes

The event space is the number of outcomes in the event you are interested in.

P=size of the event space/size of the sample space

step 1

find the probability that Joey will be first

size of the sample size=12

size of the event space=1

P=1/12

step 2

find the probability that Chloe will be second

size of the sample size=12-1=11

size of the event space=1

P=1/11

step 3

find the probability that Zoe will be third

size of the sample size=11-1=10

size of the event space=1

P=1/10

step 4

Find the probability that Joey will be first, Chloe will be second, and Zoe will be third

P=(1/12)*(1/11)*(1/10)-----> P=1/1320-----> 0.00075------> 0.076%

the answer is

the probability that Joey will be first, Chloe will be second, and Zoe will be third is 0.00075 (0.076%)

4 0

4 years ago

Don't spam answer only if you know What is the measure of angle x? Enter your answer in the box

Fudgin [204]

Answer:

The angle of x is 83°

Step-by-step explanation:

A straight line has a total of 180°. That means if you can figure out what the third angle on the bottom is (the one in the middle) you can add 41 to it and subtract that from 180. Since all the lines are straight you can say that the middle angle on the bottom is the same as the middle angle on the top. So:

180° - (41° + 56°) = 83°

5 0

3 years ago

What would the equation be if the slope was 0, and the y intercept was -4

Mazyrski [523]

Answer:

y=0x-4

y=-4

depending on how they want you to write it

Step-by-step explanation:

The formula is y=mx+b

(m) is slope

(b) is y intercept

y=mx+b

y=0x-4

y=-4

Hope this helps! If you have any questions on how I got my answer feel free to ask. Stay safe!

7 0

3 years ago

Read 2 more answers

Someone please help me quickly i will give brainlyist

scZoUnD [109]

(16,5) it should be

16 input

5 output

if you went to 5 ont he y-axis and keep going till it hits the line the x seems to be 16.

im deeply sorry if this is wrong.

4 0

3 years ago