So the equation looks like this : 15*3x=78
subtract 15 from both sides: -15 -15
then divide by 3 from both sides
to isolate the variable: 3x=63
3/3x=63/3
x=21 (your mystery number is 21)
Answer:
Range is 8
Step-by-step explanation:
To find range you need to subtract the largest number with the smallest. The largest is 28 and the smallest is 20.
28-20=8
