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ira [324]
3 years ago
14

The greatest comen factor of 21, 30,49

Mathematics
1 answer:
liq [111]3 years ago
4 0
The greatest common factor for 21 is 7
For 30 is 15
49 is 7

I’m no totally sure but i think that is right
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If you eat 5 grapes per minute for 8 minutes, how many grapes will you eat?
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Answer:

40 Grapes

Step-by-step explanation:

5x8=40

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You cut 63 meters of rope into 9 equal pieces. How long is each equal piece of rope?
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to qualify for a discount, clays soccer team spend at least $560 on new jerseys. the team needs 20 jerseys. write an inequality
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3 0
3 years ago
Can you please help me solve 18 and 21 please?
olya-2409 [2.1K]
<h3>Answer:</h3>

18. x = y = -3

21. y was substituted into the wrong equation. The solution is (x, y) = (2, 1).

<h3>Step-by-step explanation:</h3>

18. Adding y to the first equation transforms it to ...

... x = y

Then you can substitute for either variable in the second equation.

... 2y -5y = 9 . . . . . substitute for x

... -3y = 9 . . . . . . . . simplify

... y = -3 . . . . . . . . . divide by the coefficient of y

.. x = -3 . . . . . . . . . x and y have the same value

___

21. The first equation is being used to find an expression for y in terms of x. If you substitute that expression back into the same equation, it will tell you nothing you didn't already know. (Here, it is telling you 5 = 5.) The expression is only useful if you <em>substitute it into a different equation</em>. Here, it needs to be substituted into the second equation:

... <u>Step 2</u>: 3x -2(-2x+5) = 4 ⇒ 7x -10 = 4 . . . . . substitute for y in the second eqn

... <u>Step 3</u>: 7x = 14 . . . . . add 10

... <u>Step 4</u>: x = 2 . . . . . . . divide by 7

... <u>Step 5</u>: y = -2·2 +5 = 1 . . . . . find the value of y from x using the expression from step 1. Now, you know the solution is (x, y) = (2, 1).

_____

The attached graph shows the solution to the problem of 21.

4 0
4 years ago
Please Answer Attachment Below Thanks
docker41 [41]

Answer:

Step-by-step explanation:

The interior angles of a heptagon add up to 5*180 = 900

So

x + 143 + 116 + 135 + 135 + 116 + 155 = 900     Add up the known angles

x + 800 = 900                                                   Subtract 800 from both sides

x + 800 - 800 = 900 - 800                              Combine

x = 100

8 0
4 years ago
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