Need help with Geometry! This is the last question that I am stuck on. It's the only one that I got wrong.

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

The fraction of defective integrated circuits produced in a photolithography process is being studied. a random sample of 300 circuits is tested, revealing 17 defectives. (a) calculate a 95% two-sided confidence interval on the fraction of defective circuits produced by this particular tool. round the answers to 4 decimal places. less-than-or-equal-to p less-than-or-equal-to (b) calculate a 95% upper confidence bound on the fraction of defective circuits. round the answer to 4 decimal places. p less-than-or-equal-to

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76