Answer:
im not 100% but i think its
T= 2t-4+(t-4)+7
Answer:
0.2425373
Step-by-step explanation:
78 divided by 321.6 equals to 0.2425373
Let the number of hours = x
Mine A is offering his services for an initial $90 in addition to $15 per hour.
So, Charges of A = 90 + 15x
Mine B is offering her services for an initial $30 in addition to $35 per hour.
so, Charges of B = 30 + 35x
The two mines charge the same amount of money when:
Charges of A = Charges of B
So,

solve for x
combine like terms

so, the two mines will charge the same amount of money when the number of hours = 3