Which of the following infinite series has a finite sum? explain your reasoning.
a. 1.5+3+6+12+
b. 2+8+32+128+
c. 4+4.2+4.4+4.6+
d. 20+10+5+2.5+

Y=4x^2+x-1 solve using quadratic formula

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.