Answer:
3840
Step-by-step explanation:
Hope this helps you out
mean: 40.25
median: 40
mode: 40
No.
If 42 is removed all values will be equal to 40.
opening the brackets we have;
3t+15+5t+15=-4t-12
collect like terms
3t+5t+15+15=-4t-12
8t+30=-4t-12
8t-4t=-12+30
4t=18
t=18/4