Please help me! I'm taking a test that closes in 10 minutes! 1) Simplify √-49 using the imaginary unit i.
2) Simplify √-20 using the imaginary unit i.
3) Simplify the expression. Write it in standard form. (-3 + 2i) + (2 + i)
4) Simplify the expression. Write it in standard form. (9 +4i)²
5) Simplify the expression. Write it in standard form. (5i √-32) (i √-27)

Regular price 75$ discount 25%sale price?

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.