exam Maths Puzzle Numerical Ability

Please help me solve these four indicated operations, thank you

13.4.5

(7.1)(3.94)

0.4+0.44+0.444

4.74-3.69

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exam Other Question

(x-2)^2+x^2=10 indicate whether each statement is true Always, Sometimes, or never.
a. If a triangle is obtuse, it is isosceles.
b. The bisector of the vertex angle of a scalene triangle is p