What is the sum of the first five terms of the geometric series 2 - 10 + 50 - ...? S= a(1-r/1-r, r does not equal 1, where a is the first term and r is the common ratio.

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

Identify the number 127 as a rational or irrational. explain