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ACT test scores are approximately normally distributed. Last year, the scores had a mean of 21 and a standard deviation of 3.4. What is the range
of scores that encompassed 95% of all the scores?
10.8 to 31.2
14.2 to 31.2
10.6 to 24.4
14.2 to 27.8
17.6 to 24.4
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Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Let hh represent the number of hummingbirds and ss represent the number of sunbirds that must pollinate the colony so it can survive until next year. 6h+4s > 746h+4s> 74 this year, 88 hummingbirds pollinated the colony. what is the least number of sunbirds that must pollinate the colony to ensure that it will survive until next year?