exam Maths Puzzle Numerical Ability

Find the value of x in the equation 5x+20=4x+30

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exam Other Question

You have grades of 81, 99, 95, 75 and 85 in your history class. You want to have at least an average of 89 in the class by report card time. What must you average on the next four tests for this to happen? Find the domain f(x)=7+sqrt(3x+21) and express it using interval notation