The answer is 48 because you have to do is 21 x 4 which is 48
Answer:
50
Step-by-step explanation:
22 for the long sides
22+22=44
3 for the short sides
3+3=6
44+6=50
To find the average, you have to add all the numbers up and then divide by the amount of numbers you added together.
Equation: (86+87+91+x)/4=98
Solve for x:
86+87+91+x=98*4
264+x=392
x=392-264
x=128
The fourth number is 128