Which of these sequences is a geometric sequence?
a) 1, 2, 4, 7, 11, 16, 22, …
b) 2, 4, 8, 14, 22, 38, …
c) 3, 6, 9, 12, 15, 18, 21, …
d) 3, 9, 27, 81, 243, 729, …

Arley is building a model of a city map. in one part of the city, three roads form a right triangle, which harley draws as triangle abc, with the following measures: m∠b=90° and m∠a=30°. in his scale model, the hypotenuse of triangle abc, ac¯¯¯¯¯¯¯¯, has a length of 817−−√ cm. what is the value of a (the length of bc¯¯¯¯¯¯¯¯)?

Kayla and alberto are selling fruit for a school fundraiser. customers can buy small boxes of grapefruit and large boxes of grapefruit. kayla sold 3 small boxes of grapefruit and 1 large box of grapefruit for a total of $65. alberto sold 1 small box of grapefruit and 1 large box of grapefruit for a total of $55. what is the cost each of one small box of grapefruit and one large box of grapefruit?

Which of the following shows the length of the third side, in inches, of the triangle below