Please help me and explain this.

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

Divide. –4.2 ÷ 6 = a –0.7 b 0.7 c –7 d 7 me

Asap! will mark brainliest! ( respond asap, it's urgent! : )) what is the slope for equation y =-3x + 8