ans is b...multiply eqn 1 by -2 and eqn 2 by 3
=》 -6x + 10y = 4...eqn 3
=》 6x + 3y = 9...eqn 4
add eqn 3 and 4...
=》13y = 13
=》y =1 and x = 1
Answer:
2.80
Step-by-step explanation:
4% of 70 is = 2.80
70% of 4 is = 2.80
For this case we have the following quadratic functions:
Revenue: 
Cost: 
Then, we observe that the profit is given by the following mathematical relationship:

Substituting values we have:

Making the corresponding calculations we have:

Answer:
An expression that represents the profit is:

Answer:
She has 7 $5 dollar bills and 4 $1 dollar bills.
Step-by-step explanation:
& times 5 plus 4.