This equation shows how the accuracy of Lena's watch is related to how long it's been since she last set it. s = d + 7

The variable d represents the number of days passed since Lena last set her watch, and the variable s represents how many seconds behind the watch is. How many days has it been since Lena last set her watch if the watch is 20 seconds behind?
_ days

The median for the given set of six ordered data values is 29.5 9 12 25 __ 41 48 what is the missing value?

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect

Given: ad¯¯¯¯¯ is an altitude. prove: ab2+ac2=cb2 right triangle a b c with right angle a. point d lies on side b c and segment a d is drawn. angle a d c is a right angle. drag and drop a reason into each box to correctly complete the two-column proof. statement reason ad¯¯¯¯¯ is an altitude, and ∠bac is a right angle. given ∠adb and ∠adc are right angles. definition of altitude ∠bac≅∠bda ? ∠bac≅∠adc ? ∠b≅∠b ? ∠c≅∠c reflexive property of congruence △abc∼△dba ? △abc∼△dac aa similarity postulate abbd=cbab ? ab2=(cb)(bd) cross multiply and simplify. acdc=cbac polygon similarity postulate ac2=(cb)(dc) cross multiply and simplify. ab2+ac2=ab2+(cb)(dc) addition property of equality ab2+ac2=(cb)(bd)+(cb)(dc) substitution property of equality ab2+ac2=(cb)(bd+dc) ? bd+dc=cb segment addition postulate ab2+ac2=cb2 substitution property of equality