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2 years ago

13

A history test has 30 questions. A student answers 90% of the questions correctly. How many questions did the student get correc

t.

1 answer:

algol132 years ago

7 0

Answer:

27 questions

Step-by-step explanation:

Hope this helps!

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Halp me pls..<br> !!!!<br><br><br> :D I will be happy

pochemuha

The probability of multiple events happening is found by multiplying the probabilities of each event together.

$P_{d+even\ number}=P_{d}*P_{even}\\\\P_{d}=\frac{number\ of\ events}{total\ number\ of\ events}=\frac{(d)}{a,\ b,\ c,\ d,\ e)}=\frac{1}{5}\\\\P_{even}=\frac{number\ of\ events}{total\ number\ of\ events}=\frac{(2,\ 4,\ 6)}{(1,\ 2,\ 3,\ 4,\ 5,\ 6)}=\frac{3}{6}=\frac{1}{2}\\\\\frac{1}{5}*\frac{1}{2}=\boxed{\frac{1}{10}}$

So yes, 1/10 is the answer :)

5 0

3 years ago

2.1d = 51.24<br> What is the answer?

erik [133]

24.4 is the answer. c:

3 0

3 years ago

5x + 9 = 10x - 9<br> How do I solve this?

dangina [55]

5x+9 = 10x-9
Take 5x from both sides
9 = 5x-9
Add 9 to both sides
18 = 5x
Divide by 5
3.6=x

6 0

3 years ago

Read 2 more answers

I have a trapezoid what is the answer for a 4 inches in height by8 inches in base

andrey2020 [161]

We need to find the other base also in order for us to find out what the area of this is.

4 0

3 years ago

I) Construct a triangle PQR such that |PQ|=8cm,{RPQ=90°{PQR=30°.Measure |RQ|

scoray [572]

Answer:

6.93 cm

Step-by-step explanation:

You have a right triangle (90°), so you do as follow:

If I understand correctly, you are looking for the hypotenuse so

$cos(30) = \frac{PQ}{QR} = \frac{8 cm}{QR}$

That is equal to $QR = cos(30)*8 cm = 6.928 cm$

5 0

3 years ago