1. a+b+c=9 and ab+bc+ca =26 find a²+b²+c². 2. if 2x +3y=12 and xy=6 find the value of 8x³+27y³.
3. factorise (a+b)³-(a-b)³.
4. if a+b+c =5 and ab+bc+ca =10 then prove that a³+b³+c³-3abc=-25

Plzzcan somone solve these question its urgent

the answers c

2 x 503

step-by-step explanation:

its 1006

the circumference of a circle is, 10.676 cm.

step-by-step explanation:

the formula for circumference of a circle is given by:

where

c is the circumference of a circle and

d is the diameter of a circle.

given: diameter(d) = 3.4 cm and use

substitute these values in [1] we get;

cm

therefore, the circumference of a circle is, 10.676 cm