(1) what is the value of x?
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x=
a right triangle. the legs are labeled x and twelve, and the hypotenuse is labeled thirteen.

(1) which set of side lengths form a right triangle?

(a) 7 cm, 8 cm, 10 cm

(b) 14 m, 20 m, 25 m

(c) 10 cm, 6 cm, 8 cm

(d) 3 ft, 6 ft, 5 ft

(3) in the coordinate plane, what is the length of the line segment that connects points at (0, −1) and (−7, −2) ?
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round to the nearest hundredth.