How do I explain how to find one quantity as a percentage of another

  multiply the ratio of quantities by 100%

Step-by-step explanation:

You usually explain a process by describing how it is done. The ratio of two quantities is expressed as a percentage by multiplying that ratio by 100%.

Example

  A as a percentage of B is (A/B)×100%.

You will often see a description of finding a percentage as involving multiplication by 100. What multiplication by 100 does is give you a quantity 100 times as large. Generally, that will not be the number you are looking for.

For example, one out of four as a percentage is not (1/4)·100 = 25. 25 is two tens plus 5, a number way larger than 1/4. Rather, it is (1/4)·100% = 25%.

"Percent" and "hundredths" are interchangeable. The percent symbol (%) is a shorthand way to write /100, which is what it means. Consider the above example:

  25% = 25/100 = 1/4 . . . . these are all the same value, written differently

In decimal, ...

  25% = 25/100 = 0.25 . . . . these are all the same value, written differently

answer: standard form is ax^2 + bx + c = 0

step-by-step explanation:

standard form is ax^2 + bx + c = 0

(2x + 1)(x - 2) = 0

distribute to get into standard form

2x^2 - 4x + x - 2 = 0

2x^2 - 3x - 2 = 0

a = 2, b= -3, c = -2

a is your answer

sorry, i don't know i just need points, i'm new here. chao