How to do this operation (11+1) -6 x8 + 16

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

Could someone with number 1 and 2

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?