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DIA [1.3K]
3 years ago
9

Factor the expression. 3x + 21

Mathematics
2 answers:
julsineya [31]3 years ago
7 0

Step-by-step explanation:

3(x +7)

x=7

( 3x+12 )= 3

HOPE THIS HELPS:)

Delicious77 [7]3 years ago
5 0

Answer: 3  ( x + 7 )

Step-by-step explanation:

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HELPPPP PLEASE HELP ME WITH BASIC MATH I REALLY APPRECIATE IT ((WILL MARK AS BRAINLIEST))​
Yakvenalex [24]

Answer:

3) 522

4) 468

Step-by-step explanation:

hello!

3) in the question, it says the cross section is a square, and the area of PQRS is 81.

for the square, we know that the length and height have to be the same, so if the area is 81, then we know the sides are both 9 because 9*9 is 81 and they're the same numbers multiplied. (same height and length)

with the information that all 4 sides of the square is 9 and the other side is labeled 10, we can figure out the rest.

both squares : 81+81=162

both 10 by 9 sides: 90+90=180

both 10 by 9 sides (top and bottom): 90+90=180

total surface area=162+180+180=522

4) for this problem, we can see that the triangle is a right triangle.

to solve the area of the triangle, we can do (9*12)/2=108/2=54.

there are two sides with triangles, so we double 54 (54*2=108)

9 by 10 side: 90

10 by 12 side: 120

now for the last slide, theres no information on the length. the formula for the diagonal is

a^2+b^2=c^2

which is

9^2+12^2=81+144=255=15^2

with this, the area of the rectangular side gives us 10*15 which is 150.

adding it together, we get

108+90+120+150=468.

hope this helps!

7 0
2 years ago
What is the answer? I am so lost- thanks for any help given.
aev [14]

Answer:

i think that the answer is 13 meters

Step-by-step explanation:

7 0
3 years ago
Simplest form for 21/49
tekilochka [14]
21/49
=3/7(divide by 7 numerator and denominator)
PLs brainliest answer
4 0
3 years ago
People in Spaceland live in 8 space stations, and travel between the stations in tubes.Every pair of stations is connected by tw
NeTakaya

Based on the way these stations are connected, we can infer that there are <u>56 tubes. </u>

<h3>Number of tubes in Spaceland </h3>

Each pair of stations have 2 tubes. This means that every station is connected to each of the others.

We can therefore infer that each station has 7 tubes to the other stations.

The total number of tubes would therefore be:

= Number of stations x Number of tubes per station

= 8 x 7

= 56 tubes

In conclusion, there are 56 tubes.

Find out more on proportionality problems at brainly.com/question/24822176.

3 0
2 years ago
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galben [10]
Alice Binney invented them.
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3 years ago
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