exam Maths Puzzle Numerical Ability

can someone help me solve these??? please!!!
sqrt x-5=9 and 3 to the sqrt of x-4-2=10

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The daily low temperatures in degrees Fahrenheit for a certain week were -3,1,4,-5,-10. What is the range of low temperatures for that week? A motorboat travels 120km upstream and then 120km downstream in a total of seven hours. If the speed of the river's current is 5km/h,then what is the speed of the motorboat in stil