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3 years ago

The sum of two numbers is 56,and their difference is 10.What are the numbers?

1 answer:

6 0

So, X + Y = 56, and X - Y = 10.
We can say X = Y +10, so we can also say:
(Y+10) + Y = 56
2Y + 10 = 56

2Y = 46

Y = 23.

Then we can say

X - 23 = 10

So X = 33

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3 years ago

Please help ill give whoever answers the best the brainliest answer :0

Greeley [361]

Expression (5x² - 2x + 7), ( $\frac{1}{5}x^3 -\frac{7}{2}x^2 -2$ ) and (y⁵ - √(5y²) + 7) are polynomials.

<h3>What is a polynomial ? </h3>

A polynomial is a type of algebraic expression where exponents of all variables are whole number.

1) 5x² - 2x + 7

Since there are no variables raised to negative or fraction exponents,

the expression is a polynomial.

2) $\frac{1}{5}x^3 -\frac{7}{2}x^2 -2$

Since there are no variables raised to negative or fraction exponents,

the expression is a polynomial.

3) y⁵ - √(5y²) + 7

This can be re-written as

$y^5-(\sqrt{5})y+7$

Since there are no variables raised to negative or fraction exponents,

the expression is a polynomial.

4) $\frac{y^3}{3} -\sqrt{y} +2$

This can be re-written as

$\frac{1}{3}y^2 -y^{1/2}+2$

Since variable y is raised to a fraction exponent,

the expression is not polynomial.

Therefore, expression (5x² - 2x + 7), ( $\frac{1}{5}x^3 -\frac{7}{2}x^2 -2$ ) and (y⁵ - √(5y²) + 7) are polynomials.

Learn more about polynomials here: brainly.com/question/17822016

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2 years ago

Which one is the right one?

Aloiza [94]

Answer:

2x-8=x+16

2x-x=16+18

x=24

2y=y+19

2y-y=19

y=19

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3 years ago

Read 2 more answers