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3 years ago

Jake says adding 0 to an addendum does not change a sum. Is he correct

Mathematics

1 answer:

siniylev [52]3 years ago

5 0

Nothing changes if you don't add anything.

Example:

10+10=20
20+0=20

nothing changes.

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If 21 is added to a number the result is 40 less than twice the number what is the number?

Karolina [17]

If 21 is added to (+ 21) a number (x) the result (=) is 40 less than (- 40) twice the number (2x)

x + 21 = 2x - 40 Add 40 to both sides
x + 61 = 2x Subtract x from both sides
61 = x Switch the sides to make it easier to read
x = 61

7 0

3 years ago

Which of the following is the product of the rational expression shown below

wolverine [178]

Option C: $\frac{x^{2}-9}{x^{2}-4}$ is the product of the rational expression.

Explanation:

The given rational expression is $\frac{x+3}{x+2} \cdot \frac{x-3}{x-2}$

We need to determine the product of the rational expression.

<u>Product of the rational expression:</u>

Let us multiply the rational expression to determine the product of the rational expression.

Thus, we have;

$\frac{(x+3)(x-3)}{(x+2)(x-2)}$

Let us use the identity $(a+b)(a-b)=a^2-b^2$ in the above expression.

Thus, we get;

$\frac{x^{2} -3^2}{x^{2} -2^2}$

Simplifying the terms, we get;

$\frac{x^{2}-9}{x^{2}-4}$

Thus, the product of the rational expression is $\frac{x^{2}-9}{x^{2}-4}$

Hence, Option C is the correct answer.

6 0

3 years ago

Graph y = - 3x + 7 .

lbvjy [14]

Answer:

put your first point at 7 in y axis that point go down 3 to the rights side 1 and your point should be at (1,4) then connect the dots and that's how you graph it

Step-by-step explanation:

5 0

3 years ago

Can I please get some help with this :D

Luba_88 [7]

1. Anwser=53.3 (do 40*3 then anwser x 4)
2anwser=120

6 0

2 years ago

How to make this y=21x-7 into standard form

Galina-37 [17]

The standard form is 21x-y-7=0

6 0

3 years ago