Which of the following can be used to measure heart rate?

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

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?

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.