What could make a helicopter work in a vacuum

What is the probability of rolling a 1 with a number cube that has the numbers 1, 2, 3, 4, 5, and 6 and tossing heads with a coin? A. 1/12 B. 1/8 C. 1/2 D. 2/3

Emmanuel added 8 links per minute to his chain mail. Allesia started 20 minutes after Emmanuel and added 13 links per minute to her chain mail. How long had Emmanuel worked when Allesia caught up to him, and how many links had he added?

Which of the following statements is true? A. A higher saving rate allows us to invest in our capital stock and results in economic growth. B. Investment in our capital stock lowers our growth rate and living standards. C.

A study that surveyed a random sample of otherwise healthy high school students found that they arc more likely to get muscle cramps when they are stressed. The study also noted that students drink more coffee and sleep less when they are stressed.

If there are 1000 grams in a kilogram in 454 grams in a pound how many pounds are there in a kilogram?

Find the mean, median, and mode of the data. 67, 59, 34, 71, 59

Salma purchased a prepaid phone card for $15 Long distance calls cost 6 cents a minute using this card. Salma used her card only once to make a long distance call. If the remaining credit on her card is $13.14 how many minutes did her call last?

Is a negative plus positive is negative

A number increased by 29 is 40

What is the vertex of the quadratic functio f (x) = (x-6) (x+2) ?