Every summer I drive to Michigan. It is 3900km to get there. If I average 100km/hr, how much time will I spend driving?

39 hours.

Step-by-step explanation:

You divide 3900 km by 100 km, (3900/100) and get 39. Since you are driving 100 km per hour, it will take you 39 hours to get to Michigan.

infinitely many solutions

step-by-step explanation:

we have been given the equation;

2(2x + 3) = -4 + 2(2x + 5)

we need to determine the value of x.

2(2x + 3), we expand this expression to obtain 4x + 6

similarly 2(2x + 5) will become 4x + 10

now we have;

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 10 - 4

4x + 6 = 4x + 6

the expression on the left hand side is identical to the one on the right hand side. therefore, we are looking at just a single straight line whose equation is;

y = 4x + 6

consequently, we shall have infinitely many solutions