Find the range of 15,12,21,18,25,11,17,19,20

25-11

Range is 14

Step-by-step explanation:

To find the range, first put your numbers in order from least to greatest. Now, subtract the smallest value from the largest value to get the range.

side side side

side angle angle

angle side angle

side angle side

step-by-step explanation:

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a