Plzzz help! I will give brainiest and 100 points! 4x2 = 0 (the 2 is an exponent)

What is the value of x when x + 7 = 21?

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers

Which problem would you use the following proportion to solve for? 24/x = 40/100 a. what is 40% of 24? b. what percent is 24 of 40? c. twenty-four is 40% of what number? d. forty percent of 24 is what number?