How to write [4 -v] is less than 5 as two inequalities without absolute value

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.