exam
Maths Puzzle
Numerical Ability
An air sample 4.0 ppm (parts per million) of two pollutants. The concentration of one is four times the other. What are the concentrations?
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Factor Completely please...
16x^4-81y^4
12b^2+6ab-36a^2
6x^2-30xy+24y2
9a^4+36b^4
25x^4-40x^3+16x^2
81r^4-256s^4
16(x-y)^2-9
x^4-81
x^2+3x=0
Please help me with this problem
the sequence of numbers is 16,24,__,54,81..
what number belongs in the third position?