book Maths Puzzle Numerical Ability

Can you show me the steps to get the answer for this problem.--- The problem as follows:

7x+3+10x

Thank you,
Candace

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book Other Question

Find the missing factor:

(6x4) (to the 4th power) = (3x3) (to the 3rd power) = ( )

-35x2y (to the 2nd power)= (-5xy) = ( ) write the equation in logarithmic from: cube root of e = 1.40 or 3^root of e = 1.40