Which statement is not true?
a every integer is a real number.
b every counting number is an integer.
c every integer is a rational number.
d every decimal number is an irrational number.

3-12. write each answer with a reasonable number of figures. find the absolute uncertainty and percent relative uncertainty for each answer. (a) [12.41 (±0.09) + 4.16 (±0.01)] x 7.068 2 (±0.000 4) =? (b) [3.26 (±0.10) x 8.47 (±0.05)] - 0.18 (±0.06) =? (c) 6.843 (±0.008) x 104 + [2.09 (±0.04)- 1.63 (±0.01)] =?

Select the quadratic that has root x = 8 and x = -5

X2 + y 2 = 36 x + y = 6 solve the system of equations.