What ranges of scores have a frequency of 1

20-30 & 40-50

Step-by-step explanation:

To find which range of scores have a frequency of 1, let's break it all down into separate ranges.

20-30: 1

30-40: 2

40-50: 1

50-60: 2

60-70: 6

70-80: 9

80-90: 13

90-100: 5

We can see in our different ranges that the range 20-30 and 40-50 have a frequency of 1.

How did we find this?

Analyze the chart and find which area shows the range, the bars are the frequencies of the different ranges.

since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation:

income. 10x+1300

expenses 3x+(1800+1500)

expenses 3x+3300

to break even:

income = expense,

10x + 1300 = 3x + 3300,

solve for x.

step-by-step explanation:

mark brainliest