What is ratio of 28 red pens and 84 black pens

Suppose that a die-hardly-ever battery has an exponential time-to-failure distribution with a mean of 48 months. at 60 months, the battery is still operating. what is the probability that the battery is going to last for the next 12 months?

Convert the angle 0=14pi/9 radians to degree

How many minutes is it from 7:00 a. m. to 11:45 a. m.?

A. Fill in the boxes: 8 tens + 19 ones = 9 tens + ones 8 tens + 2 ones = 7 tens + ones 7 tens + 25 ones = 9 tens + ones 70 + 11 = 80 + 50 + = 60 + 3 90 + 13 = + 3

If one card is drawn from a standard deck of 52 playing cards what is the probability of it is not a heart

To solve a system of equations by substitution what is the best first step

Which rational number does not have a reciprocal

What is the probability of rolling an odd number on a number cube and flipping a coin landing on tails? A) 1/6 B) 1/12 C) 1/4 D) 1/8

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The number Of households with VCRs in 1990 was about 87.5% of the number with VCRs in 1993. About how many households had VCRs in 1993? 1989 ~ 1 household 1985 ~ 18 households 1990 ~ 63 households 1995 ~ 77 households