All categories

3 years ago

21 is 20% of what number

Mathematics

2 answers:

Klio2033 [76]3 years ago

7 0

105%. Convert fraction (ratio) 21 / 20 Answer: 105% . Hope this helped !!

Ksenya-84 [330]3 years ago

6 0

Answer:

21 is 20% of 105

Step-by-step explanation:

20% * x = 21

20/100 * x = 21

x = 21 * 100/20

x = 105

If you are using a calculator, simply enter 21×100÷20, which will give you the answer.

You might be interested in

Hannah has 127 books in her collection. Her school is hosting a book donation. There are z students at her school, and they each

IgorC [24]

She has to donate 46 more 127 x 2 +n=300 You have to add 127 twice, which gives you 254. Then you subtract that from 300.

6 0

3 years ago

Find all the zeros of the equation<br> -3x^4 + 27x^2 + 1200 = 0

guajiro [1.7K]

Answer:

$\displaystyle x=-5,\ x=5,\ x=4i,\ x=-4i$

Step-by-step explanation:

Biquadratic Equation

It's a fourth-degree equation where the terms of degree 1 and 3 are missing. It can be solved for the variable squared as if it was a second-degree equation, and then take the square root of the results

Our equation is

$\displaystyle -3x^4+27x^2+1200=0$

If we call $y=x^2$ , our equation becomes a second-degree equation

$\displaystyle -3y^2+27y+1200=0$

Dividing by -3

$\displaystyle y^2-9y-400=0$

Factoring

$\displaystyle (y-25)(y+16)=0$

It leads to these solutions

$\displaystyle y=25\ ,\ y=-16$

Taking back the change of variable, we have for the first solution

$\displaystyle x^2=25\Rightarrow x=-5,x=5$

Now for the second solution, we get imaginary (complex) values

$\displaystyle x^2=-16\Rightarrow x=4i,\ x=-4i$

Summarizing, the four solutions for x are

$\displaystyle x=-5,\ x=5,\ x=4i,\ x=-4i$

5 0

2 years ago

Find lim<br> 12+1)-(2)<br> if f(x) = x² + x + 1

kotegsom [21]

Answer:

The answer is 11 Hope this helps ;)

Step-by-step explanation:

7 0

2 years ago

A car salesman earns 2% commission on all of his sales. If he needs to make $3,000 a month for his living expenses, what total d

Sonja [21]

He must sell 150,000 dollars worth of something to make 3,000 in commission each month.
I hope this helps!

8 0

2 years ago

What is 71.09 rounded off to the nearest whole number

masha68 [24]

It is 71 because 0 is less than 5, so it stays the same.

5 0

3 years ago