(a) Which unit fraction 1/n for n ≤ 50 has the decimal expansion of the longest period?

Abike shop sells you a bicycle for $63 and a helmet for $21. the total cost is 150% of what the shop spent originally. how much did the shop spend originally? how much profit did the bike shop earn by selling the bicycle and helmet to you ?

The focus of parabola is (-4, -5), and its directrix is y= -1. fill in the missing terms and signs in parabolas equation in standard form

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.