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3 years ago

15

Simplify the expression by combining like terms: x + 7x

2 answers:

Aneli [31]3 years ago

6 0

Answer:

Like terms means that the numbers have the same variable after them or they don't have a variable at all. It is also important to remember that any letter that doesn't have a number in front of it technically has a 1 in front of it.

For example, x + 3x = 1x +3x. Then I add the numbers in the front and I get 4x.

If it had been 4x + 7x + 3, my answer would have been 11x +3. That's because there were a total of 11 x, but the 3 ones weren't x's so I just leave them alone.

Step-by-step explanation:

alexira [117]3 years ago

5 0

Answer:

$8x$

Step-by-step explanation:

$x+7x$

$8x$

The answer is $8x$ when you simplify because you are adding another $x$ to $7x$ so it becomes $8x$

Hope this is helpful

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Joanne had $115 to spend at the mall. She spent 23% of that money on a shirt. How much did Joanne spend on the shirt?

-Dominant- [34]

The answer would be $26.45.
What you do is on a calculator: 115 x 23%
Hope this helps :)

3 0

3 years ago

Find the percent decreased original price: $40 sale price: $30

stich3 [128]

Answer:

25 percent

Step-by-step explanation:

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= 10/40 * 100 percent

= .25 * 100 percent

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3 years ago

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kaheart [24]

Answer:

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Step-by-step explanation:

4 0

3 years ago

16.45 markdown 33% what’s the anwser

Fittoniya [83]

dude, use a calculator

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

What is the sum of 20x^2-10x-30

ivann1987 [24]

Answer:

The sum of the roots is 0.5

Step-by-step explanation:

<u><em>The correct question is</em></u>

What is the sum of the roots of 20x^2-10x-30

we know that

In a quadratic equation of the form

$ax^{2} +bx+c=0$

The sum of the roots is equal to

$-\frac{b} {a}$

in this problem we have

$20x^{2} -10x-30=0$

so

$a=20\\b=-10\\c=-30$

substitute

$-\frac{(-10)} {20}=0.5$

<u><em>Verify</em></u>

Find the roots of the quadratic equation

The formula to solve a quadratic equation is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

$a=20\\b=-10\\c=-30$

substitute

$x=\frac{-(-10)\pm\sqrt{-10^{2}-4(20)(-30)}} {2(20)}$

$x=\frac{10\pm\sqrt{2,500}} {40}$

$x=\frac{10\pm50} {40}$

$x=\frac{10+50} {40}=1.5$

$x=\frac{10-50} {40}=-1$

The roots are x=-1 and x=1.5

The sum of the roots are

$-1+1.5=0.5$ ----> is ok

5 0

3 years ago