Can a kind soul pleaseee help me??? Consider the line y = 4x + 9. If a *second* line is perpendicular to this one, what is its slope?

please show how you got it so I can see if the answer makes sense

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?

Tell whether the two rates form a proportion

Agroup of three friends order a combo meal which includes two slices of pizza and a drink each drink is priced at $2.50 the combined total of $31.50 how much is the cost of a slice of pizza