exam Maths Puzzle Numerical Ability

"Solve each equation by eliminating the decimals":

0.5b + 3.4 = 0.2b + 12.4

Thank you!

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exam Other Question

Help I do not understand this at all! Thanks so much for any help given.
It says find the function value f(x)=x3
f(-2)= ? write an equation for the circle with the endpoints of the diameter at (-2,13) and (8,7)