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3 years ago

Help please? Answer 21.

Mathematics

1 answer:

Oksi-84 [34.3K]3 years ago

8 0

-1,-3/4,-5/8,-1/20,0

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Work out the sum of 13/15 and 3/10 . Give your answer in its simplest form.

Crank

Answer: 26

Step-by-step explanation:

cut 3 and 15

cut 5/10 which was 15/10

15/10=2

then multiply 13*2 = 26

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3 years ago

Suppose you guess that there are 300 gum balls in a jar, but there are actually 400. What was the percent error?

chubhunter [2.5K]

Answer:

I believe the answer is 25%.

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3 years ago

Given f(x) = + 2, find f(0)

horsena [70]

Answer:

Step-by-step explanation:

toookt the test dude

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3 years ago

A steel ball is dropped from a building’s roof and passes a window, taking 0.125 s to fall from the top to the bottom of the win

Anna35 [415]

Answer:

20.425 m

Step-by-step explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.81 m/s²

$s=ut+\frac{1}{2}at^2\\\Rightarrow u=\frac{s-\frac{1}{2}at^2}{t}\\\Rightarrow u=\frac{1.2-\frac{1}{2}\times 9.81\times 0.125^2}{0.125}\\\Rightarrow u=8.98\ m/s$

Now this will the final velocity when it reaches the top of the window

$v^2-u^2=2as\\\Rightarrow s=\frac{v^2-u^2}{2a}\\\Rightarrow s=\frac{8.98^2-0^2}{2\times 9.81}\\\Rightarrow s=4.11\ m$

$v=u+at\\\Rightarrow v=8.98+9.81\times 0.125\\\Rightarrow v=10.21\ m/s$

If the upward flight is an exact reverse of the downward flight then the time taken while going down will be 1 second and going up will be 1 second.

$s=ut+\frac{1}{2}at^2\\\Rightarrow s=10.21\times 1+\frac{1}{2}\times 9.81\times 1^2\\\Rightarrow s=15.115\ m$

Hence total height of the building is 4.11+1.2+15.115 = 20.425 m

4 0

3 years ago

Which of the following systems of linear equations has no solution?

Nikolay [14]

Answer:

3rd choice

Step-by-step explanation:

The answer is the 3rd choice.

x cannot be 3 and 5 at the same time.

x = 3

x = 5

Subtract the first equation from the second equation.

x - x = 5 - 3

0 = 2

Since 0 = 2 is a false statement, there is no solution.

Answer: 3rd choice

7 0

3 years ago