The slope of the line that passes through the points (-5, -3) and (3, -3) is
a undefined
b positive
c negative
d zero

What is the number 321,000,000 in scientific notation? also what is the number? ?

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?