What was the sensitive, well-insulated tool willard f. libby used to date artifacts with known ages?
a. x-ray machine
b. richter scale
c. geiger-müller tubes
d. petri dish
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Which math sentence can be used to determine if the triangle is a right triangle?

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126

Sam is picking fruit from a basket that contains many different kinds of fruit. which set of events is independent?