Write a number sentence to add 6 ones to 21

Mathematics

2 answers:

makvit [3.9K]2 years ago

7 0

6 + 21 = 27 (Add six ones)
60 + 21 = 81 (Add six tens)

wolverine [178]2 years ago

7 0

Answer:

The required number sentence is 6 + 21 = 27.

Step-by-step explanation:

We are required,

To write a number statement in order to add 6 ones to 21.

Now as we know,

'Ones' refer to the unit number 1.

Then '6 ones' means that the number is 6×1 = 6

Thus, we get that,

Hence, the required number sentence is 6 + 21 = 27.

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1. Solve the system by using a table. 3y=4x+7 , -4x-4y=28. These are the possible solutions: A) (–4, –3), B) (–3, –4), C) (4, 3)

melisa1 [442]

The first question:
3y=4x+7 (1)
-4x-4y=28 (2)

Let's plug in x = -4, -3, 3, and 4 and see the y-values :)

I have attached the table since it's hard to make a table with text :P
As you can see, when x = -4, that is when the y-values are equal. That means that is the solution to the system of equations. Your answer is A) (-4, -3).

The second question:
-3x-y=-10 (1)
4x-4y=8 (2)

When you graph both equations, you will see that they intersect at D) (3, 1).

The third question:
We need to find the lines for revenues and expenses.
To find the line for revenues, make months the x-value and revenues the y-values. And find the equation. You should get y = 4,100x + 300.
To find the line for expenses, make months the x-value and expenses the y-values. And find the equation. You should get y = 1,900x + 19,990.

Now graph both solutions and see where they intersect. They intersect at approximately (8.95, 36995)

That would be during the month of C) August.