Write 7.4 as a mixed number in simplest form

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this 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?

What is the circumference of a circle with an area of 50.24 cm²?