www.bbcnoun.com.ng ECO255 1. The respective value of x and y in this problem: 2x + y = 9 …..(1) , 3x -y = 16 ………(2) are 5,-1 2. Solve (3+2i)(4+5i) 2 + 23i 3. Converting these base ten numbers 20 and 16 to base 8, will give us 24 and 20 respectively 4. A set of all the subsets of a set is called a ___ set power 5. An acute angle is an angle from ___ degrees downwards 90 6. What is the value of log4 1/256 -4 7. The binary value of 16 is__ 10000 8. The following are the basic number system except Maginary Numbers 9. (b2 - 4ac) in the quadratic formula, is usually referred to as the ___ Discriminant 10. Given the following equation, 2y + 12 what value of y will produce an acute angle 20