What is he solution set of 7^x-2/10=square root of seven

Select a graph that have an equation with a < 0

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

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?