If a 6oclock grandfather clock struck 6 times. If it was 30 secs between the first and last strokes, how long will it take the same clock to strike noon

Which addition property is being illustrated below? (type commutative or associative) (6 + 7) + 1 = 6 + (7 + 1)

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?