The sum of the digits of a certain two-digit number is 15. Reversing its digits increase the number by 9. find the 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)] =?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Factor the expression using the gcf. the expression 21m−49n factored using the gcf