Make x the subject of the formula y = x + a

Nine more than four times a number is the same as one less than twice the number. find the number?

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?

Which is the graph of this function 3 square root of x plus one if