Pls help me idk what formula to use and i’m stuck thanks

Me find the missing dimension of a triangle height: 7 in., area: 21^2

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

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?