A length of $$4 yards is equal to $$12 feet. $$10 yards is equal to how many feet?

What is sin 7x/4 ? i need on this urgent trig

Which of the following is true for the relation f(x)=2x^2+1

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?