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Umnica [9.8K]
3 years ago
6

Answer if you know DO NOT COPY OTHER PEOPLE PLS

Mathematics
2 answers:
Keith_Richards [23]3 years ago
7 0
Okay so...
There are 21 groups of 3.
21 x 3 = 63.
63 people are in the room.
Vilka [71]3 years ago
7 0

Answer: 63 because 21 times 3 = 63

Step-by-step explanation:

There are 63, it can't be 7 because why would there be 7 students in 21 groups, so 21 times 3 equals 63

You might be interested in
two runners start 30kilometer apart and run toward each other. they meet after 3hours. One Runner runs 2 kilometers per hour fas
belka [17]

Let the slower runners speed be X kilometers per hour.

Then the faster runners speed would be X+2 kilometers per hour.


The formula for distance is Speed times time.

The distance is given as 30 kilometers and time is given as 3 hours.


Since there are two runners you need to add the both of them together.

The equation becomes 30 = 3x + 3(x+2)

Now solve for x:

30 = 3x + 3(x+2)

Simplify:

30 = 3x + 3x +6

30 = 6x + 6

Subtract 6 from each side:

24 = 6x

Divide both sides by 6:

x = 24/6

x = 4


The slower runner ran at 4 kilometers per hour.

The faster runner ran at 4+2 = 6 kilometers per hour.


3 0
3 years ago
Emily says she can prove the Pythagorean Theorem using the following diagram. She explains that she can divide the squares on th
Sindrei [870]

Answer:

Yes, because there are 9 grid squares on one side, 16 grid squares on the other side, and 25 grid squares on the hypotenuse, and 9 + 16 = 25.

<3

4 0
3 years ago
Please help me!!!!!!!!!!!! Need help!
DaniilM [7]

Answer:

X=1 because 2+5=7 then X=1 cause 1*2=2

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
I need help please with this 1 problem
Lyrx [107]

Answer:

See below, please

Step-by-step explanation:

We know

f(x) =  {x}^{2}  + 3x - 7

g(x) = 3x + 5

h(x) = 2 {x}^{2}  - 4

Hence

f(g(x))

=  {(3x + 5)}^{2}  + 3 \times (3x + 5) - 7

= (9 {x}^{2}  + 30x + 25) + (9x + 15) - 7

= 9 {x}^{2}  + 39x + 33

h(g(x))

= 2 \times  {(3x + 5)}^{2}  - 4

2 \times (9 {x}^{2}  + 30x + 25) - 4

= 18 {x}^{2}  + 60x + 50 - 4

= 18 {x}^{2}  + 60x + 46

(h - f)(x)

= h(x) - f(x)

= (2 {x}^{2}  - 4) - ( {x}^{2}  + 3x - 7)

=  {x}^{2}  - 3x + 3

(f + g)(x)

= f(x) + g(x)

= ( {x}^{2}  + 3x - 7) + (3x + 5)

=  {x}^{2}  + 6x - 2

5 0
2 years ago
Please help will give brainliest
kotykmax [81]

Answer:

c

Step-by-step explanation:

10 times 8 = 80

80 times 3 = 240

5 0
2 years ago
Read 2 more answers
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