During the period 1990-2002, the average cost d (in dollars) for a new domestic car and the average cost i (in dollars) for a new imported car can be modeled by d= 423.12t+14475 and i= -135.63t^2+2705.2t+12121 where t is the number of years since 1990. write an equation that gives the total average cost for domestic and imported cars as a function of the number of years since 1990.

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2

The pyramid shown has a square base that is 24 centimeters on each side. the slant height is 16 centimeters. what is the lateral surface area?

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°