8 pairs of jeans and 10 shirts cost $80. The cost for 9 pairs of jeans and 5 shirts is $65. Find the cost of each pair of jeans and shirts.

Jeans: $5 Shirts: $4

Step-by-step explanation:

Above is this problem represented as a system of equations.  All you have to do is solve the system of equations, which can be done by substitution.

you didn't give me the choices, so i will just give you the graph so you can look at your choices and choose the right one.

1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours