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RoseWind [281]
3 years ago
14

Help me with this question

Mathematics
1 answer:
Vlad [161]3 years ago
8 0
Man why you asking us like we know
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1. There are 78 sophomores at a school. Each is required to take at least one year of either chemistry or physics, but they may
SVETLANKA909090 [29]

We are given that there are a total of 78 students. If we set the following variables:

\begin{gathered} C=\text{students only in chemestry} \\ P=\text{students only in physics} \\ PC=\text{students in physics and chemistry} \end{gathered}

Then, the sum of all of these must be 78, that is:

C+P+PC=78

Since there are 15 in chemistry and physics and 47 in chemistry, we may replace that into the equation and we get:

47+P+15=78

Simplifying:

62+P=78

Now we solve for P by subtracting 62 on both sides:

\begin{gathered} 62-62+P=78-62 \\ P=16 \end{gathered}

Therefore, there are 16 students in physics

3 0
1 year ago
Formula for circumference
Licemer1 [7]

Answer:

pi x diameter

Step-by-step explanation:

To calculate the circumference of a circle, simply multiply pi (3.14) by the diameter (straight line passing from side to side through the center of the circle)

For instance, if you knew the diameter of a circle was 6 inches. Simply multiply 6 inches by pi!

6 x pi = ?

? approximately equals 18.85 inches.

The circumference of the circle would be 18.85 inches!

If you only have the radius of the circle, simply multiply it by two to get your diameter. Remember, the radius is just half the length of the diameter.

Hope this helps! :)

5 0
3 years ago
Read 2 more answers
HURRY 40 POINTS !!!!!!!!! A person runs 1/4 of a mile in 1/32 of an hour. Compute the unit rate by setting up a complex fraction
hram777 [196]

I am not sure, but the best answer should be 8 miles per hour

5 0
3 years ago
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There are 250 bricks used to build a wall 20 feet high.How many bricks will be used to buld a wall that is 30 fet high
Dmitry_Shevchenko [17]

Answer: 375

Step-by-step explanation:

Since we are given the information that there are 250 bricks used to build a wall 20 feet high, the number of brick used per feet will be:

= 250/20

= 12.5 bricks per feet.

Therefore, the number of bricks that will be used to buld a wall that is 30 fet high will be:

= 12.5 × 30

= 375 bricks.

Therefore, 375 bricks would be used.

3 0
3 years ago
A soccer league has 30 seventh-graders and 15 eighth-graders. Write the ratio of seventh-graders to eight graders.
9966 [12]

Answer:

2:1

Step-by-step explanation:

30/15=2/1

2:1  is the answer you are looking for

Hope it helped

Please mark me as Brainliest

7 0
3 years ago
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