700beats/10min=70bpm
2 min to beat 140 times
4:
2 dimes, 1 penny
21 pennies
1 dime, 2 nickels, 1 penny
4 nickels, 1 penny
Therefore 
Step-by-step explanation:
Given,





Therefore 
Answer:
-9/10
Step-by-step explanation:
check answer:
number + additive inverse = 0
9/10 + -9/10 = 0