Number of hybrid cars in use in the united states

Hybrid cars are becoming the VCR/DVD-combo players of the automotive world.

Just 2% of US auto sales last year were of cars with both electric motors and internal combustion engines, according to a report published this month by New York-based consulting firm AlixPartners. That’s down from a peak of 3.1% in 2013.

So what’s behind the drop in demand? Technology. Hydraulic fracturing (aka fracking), a drilling method that led to a boom in US oil- and natural-gas production, has driven down the cost of gasoline. Prices at the pump are currently just $2.40 a gallon, according to the US Energy Information Administration, a government statistics agency, a decline of nearly 35% since 2013. Cheap gas has also rekindled Americans’ love of trucks and SUVs.

a. is correct

to find the total number of combinations, multiply the quantity of each item by each other:

2 pairs of shoes x 3 pairs of shorts = 6 different combinations.