What is the value of a

27.5
45
90
30

What is coefficient of the term of degree of degree 5 in the polynomial below

How many solutions does the nonlinear system of equations graphed below have?

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?