21. a. Biology The table shows how the number of cricket chirps per minute changes with the air temperature.
40
50
60
70
80
90
Temperature (°F)
Chirps per minute
o
40
B0
120
160
200
Find the rates of change,
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c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

the answer is 18 units because there are 18 small cubes inside the rectangle

hope this and p.s i am also in k12

step-by-step explanation: