Answer:
90
Step-by-step explanation:
a triangle's angles all add up to 180. take 51 and 39 away from 180 and you get 90
Answer:

Step-by-step explanation:
we know that
The simple interest formula is equal to

where
I is the Interest Value
P is the Principal amount of money to be invested
r is the rate of interest
t is Number of Time Periods
in this problem we have

substitute in the formula above


Answer:
10$ I think
Step-by-step explanation:
2*30=60
90-60=30
30/3=10