About 39 out of 50 earth's atmosphere is made up of nitrogen about what percent of the atmosphere is not nitrogen explained

Select true or false to tell whether the following conditional p q is true or false. use the truth table if needed. if a week has seven days, then a year has twenty months.

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared