Step-by-step explanation:
1. 3x + 4 = 19
3x = 15
x = 5
2. 7 + 2x = 15
2x = 8
x = 4
Answer:
The answer will be
E. 5√4^3
Dave needs to mow 14 lawns to have enough money to buy a bike.
180-40=140, 140/10=14. Dave needs to mow 14 lawns to have enough to buy a bike.
and 
, respectively. The total probability of knocking down at most two is thus 
, or 
.