Nikkis charges are 20,40,50,80. Dave’s charges are 25 and 37.5.
Answer:

Step-by-step explanation:
is the same as 4/3 so you'd be multiplying 4/3 x 4/3 so you multiply straight across to get 16/9 when you simplify you are left with 1 7/9
Hope that helps and have a great day!
Answer:
2.193 cm³
Step-by-step explanation:
density is mass divided by volume:

you can manipulate the formula by multiplying with volume:

then dividing by density:

in this case:

Answer:
π x radius²=πr²
Step-by-step explanation: