If a recursive process has a recurrence relation of a_k=(-2)(a_k-1) and an initial condition of a_1=1 , what is a_4 term of the sequence? *underscore is subscript
explain with steps, you in advance

(urgent ) use pi 3.14 to estimate the circumference of the circle to the nearest hundredth middle is 4in (urgent )

What is this inequality notation? t is less then or equal to 2

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?