exam Maths Puzzle Numerical Ability

Can you help me write in exponential form:
(6 suare root of x)^5

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exam Other Question

Find all the errors in the following solution to an equation:
7/x = 8/x+3 +1

7(x+3) = 8x + 1
7x + 3 = 8x
-x = -3
x= 3
When you have a problem b+4b=-90. What do you do fist and how you solve the problem.