Events a and b are disjointed. p(a) =1/10 p(b) =3/10 find p(a or b).

1.3/10
2.3/100
3.3/20
4.2/3

Plzzz plzz maths ! quadratic sequences =an^2+bn 1) 1,6,15,28,45 2)5,18,39,68,105 3) 1,8,21,40,65 4) 7,24,51,88,135 5) -1,2,9,20,35

(60 points) explain this in detail

The area (a) of a circle with a radius of r is given by the formula and its diameter (d) is given by d=2r. arrange the equations in the correct sequence to rewrite the formula for diameter in terms of the area of the circle.