exam Maths Puzzle Numerical Ability

Solve. 26x - 7(3x - 0.895) = 4x + 0.655
Please help I do not understand the whole decimal point stuff.

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exam Other Question

Graph the pair containing the given pair and find the slope.
(4, 0) (-2, -3)
Find the slope of the line.
m = ?

Can someone help me with this.
Determine if the function is odd, even or neither


f(x) = x √4 - x2

f(-x)= -x (2-(-x) (2+(-x)

-x (2x-2x)

This is where I am stuck.