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2 years ago

In a class 20 of students, 7 have a cat and

Mathematics

1 answer:

blsea [12.9K]2 years ago

8 0

Answer:

$\frac{3}{20}$

Step-by-step explanation:

Since there are 20 students, this will be the denominator.

Now, to find how many students have a dog and a cat, you need to subtract all the numbers with 20. The leftover number will be the amount of students.

7+8+8=23

23-20=3

So, there are 3 students who have a dog and a cat.

So, the fraction will be $\frac{3}{20}$

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3/4 + 3/9 how do i do this

Artist 52 [7]

Answer:

13/12

Step-by-step explanation:

Well, you can't add it yet because the denominators don't match. We can't subtract two fractions with different denominators. So you need to get a common denominator. To do this, you'll multiply the denominators times each other... but the numerators have to change as well. So, multiply 3 by 8, and get 24. Since 4 is evenly divided by 8, we can multiply just one term to get a common denominator. Multiply 3 by 2, and get 6, then we multiply 4 by 2 and get 8. Since our denominators match, we can add the numerators. So now your answer should be 9/8. Well guess what... IT IS THE ANSWER! You can't reduce it anymore so 9/8 is your answer! Hope this helped!

7 0

3 years ago

I need the answers please help 60points

enyata [817]

In 22, you're looking for the vertical height of the triangle. You're given the angle opposite the side you want to find (which I'll call $x$ ) and the length of the hypotenuse. This sets you up with the relation

$\sin2^\circ=\dfrac x{1600}\implies x\approx55.84\text{ m}$

In 23, you're given a similar situation, except now you're looking for the angle (I'll call it $\theta$ ) in the triangle opposite the side denoting the height of the airplane. So this time,

$\sin\theta=\dfrac{1500}{5000}=\dfrac3{10}\implies\theta=\arcsin\dfrac3{10}\approx17.46^\circ$

6 0

2 years ago

Read 2 more answers

-5(x+1)+3x=6-(4x-3) solve for x

PilotLPTM [1.2K]

Answer: x = -3

Step-by-step explanation:Step by step solution :

Step 1 :

Pulling out like terms :

1.1 Pull out like factors :

-x - 3 = -1 • (x + 3)

Equation at the end of step 1 :

Step 2 :

Solving a Single Variable Equation :

2.1 Solve : -x-3 = 0

Add 3 to both sides of the equation :

-x = 3

Multiply both sides of the equation by (-1) : x = -3

One solution was found :

x = -3

7 0

3 years ago

Solve for L <br> 10LW=V<br><br> i need help answering this question

vlabodo [156]

10LW=V

L/10W= V/10W

L= V/10W

3 0

3 years ago

According to a survey conducted by Deloitte in 2017, 0.4702 of U.S. smartphone owners have made an effort to limit their phone u

musickatia [10]

Answer: 0.628

Step-by-step explanation:

Probability of U.S. smartphone owners have made an effort to limit their phone use in the past : p = 0.4702

Sample size : n= 54

Mean : $\mu =(54)(0.4702)=25.39$

Standard deviation:

$\sigma=\sqrt{(54)(0.4702)}=\sqrt{25.39}\\\\\approx5.039$

The probability that between 22 and 29 (inclusively) will have attempted to limit their cell phone use in the past will be :

$P(22\leq x\leq29)=P(21$

Hence, the required probability = 0.628

5 0

3 years ago