Yesterday karen went on a bike ride. her average speed was 10 mph. today she went on another ride this time averaging 12 mph. in the two days she biked for a combined total time of nine hours let xp the number of hours. let x be the number of hours she biked yesterday. write an expression for the combined total number of hours she biked in two days
you went wrong on the 4th line while expanding the parentheses.
(x^2 + 2x)(x^2 + 2x) - 4
= x^4 + 2x^3 + 2x^3 + 4x^2 - 4
= x^4 + 4x^3 + 4x^2 - 4. (answer).
hello from mrbilldoesmath!
first glance at the numbers shows each term is 1 larger than the preceding terms. so we are adding the constant 1 to each term to get the next term. this is an arithmetic progression.
objects smaller than a piece of paper can be measured with a meter stick because anything smaller than a piece of paper can be measured with centimeters or millimeters.