What is the value of x in the equation 4/7(21/8x+1/2)=-2(1/7-5/28)? write your solution in decimal form.

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

Simplify using positive exponents only.

Ateam of runners is needed to run a 1 2 -mile relay race. if each runner must run 1 4 mile, how many runners will be needed?