(10x+21) + (13x) = 90
23x + 21 = 90
-21 -21
23x = 69
/23 /23
x = 3
10(3) + 21
30 + 21 = 51
FEH = 51
13(3) = 39
DEH =39
Rational numbers are described as "numbers that can be written as a fraction, all integers are rational numbers".
256 is a perfect square of 16 or -16.
555 is neither.
-64 is a perfect cube of -4
-4 is neither, for the square root of -4 is 2i, which is an imaginary number.
Your answer is 243.985 hope that helped:)
2, 3
7, 8
12, 13
9, 10
10 is the next, then 13
10 is the next number of the pattern.
