Idon’t understand the difference between number 3 and 4 , can somebody explain it to me pls?

The fraction 7/9 is equivalent to a percent that is greater than 100%. truefalse

Worth 100 points need the answers asap first row -x^2 2x^2 (x/2)^2 x^2 x is less than 2 x is greater than 2 x is less than or equal to 2 x is greater than or equal to 2 second row -5 -5/2 4 5 •2 is less than x& x is less than 4 •2 is less than or equal to x & x is less than or equal to 4 •2 is less than or equal to x& x is less than 4 •2 is less than x& x is less than or equal to 4

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2