Is trouble a abstract noun

What is x to the fifth power divided by x to the third? When solving a radical equation you should first isolate the radical and then both sides? Finding the nth term? What is the area of a circle with the radius of 4.9cm? Write 5748 to 2 significant figures? What is da answer for y 2x5? Is grow an adverb? Mr Joness algebra class has too many students in it If the class were split exactly in half to form 2 new classes each class would have no more than 18 students in it? What are the zeros in the function of 2X squared plus 3X -20 equals zero? True or false if a quantitative observation doesn't involve numbers or measurement? Which means a number n increased by 6.2? What does x to the power of negative 1 equal? Is the intersection of any two half-planes necessarily a half-plane? The number 630 is divisible by what single - digit numbers? Is four greater than negative eleven? How does an AP course differ from a dual enrollment? What is 21 times 3? The second of two numbers is 4 times the first their sum is 45? What type of graph is used to represent an inequality? What are the first 4 's of pi?