MATH, HELP ASAP TWO STEP EQUATIONS
What is three times the sum of a number and five times the number is thirty six what is the number

Which of the following are accepted without proof in a logical system? check all that apply.

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)