exam Maths Puzzle Numerical Ability

3. 2^r+1= 4r

4. 3^2x = 27^x+1

5. 5^x-1 = 1/125

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exam Other Question

If you have 1 over 3x3.14x(3x10to the negative exponent 3)x(5x10 to the negative exponent 5) and you need to put this into a decimal what is the decimal answer. Do you do the multi How do you solve this?
y<=2x+6
Y>-5