Nicole plays an hand held game. There were 15 questions of which she answered six incorrectly at this rate how many question should Nicole expect to answer incorrectly if she is a total of 135 questions

News cameras take an overhead picture of a crowd at an outdoor event journalist then count the total number of people in the picture and use the sample of estimate the total number of people in the crowd this process is an example of

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)

The square root of 9x plus 7 plus the square rot of 2x equall to 7