a store manager sends an email survey to customers who have registered at the store's websites. Why is this survey biased?

a phone company offers two monthly plan. plan a costs $30 plus an additional $0.14 for each minute of calls. plan b costs $8 plus an additional $0.18 for each minute of calls.

What is the slope of the line represented by the equation 3 x + 4 y =8

Sally made 3 cup. ana made twice as many cup as Sally. how many cup did they make all?

Spencer spent 4 hours doing chores over the weekend. If he spent 2/3 for an hour on each chore, how many chores did he do.

Dylan open a credit card account with $700 of available credit. Now that he has made some purchases, Dylan's account only has $532 of available credit.

10 tan = ___pounds?

0=x^2-4x+3 how many roots does this equation have

Which equation does NOT graph a line? A) y = 5 B) y = - 3x3 C) y = 2 3 x Eliminate D) y = - 8x

Henry mixes 1 cup grape concentrate with 4 cups water to make his favorite drink. How much water will he need to mix if he uses 5 cups grape concentrate

A hot air balloon rises at a rate of 38 km/h and starts at the height of 60 km. Another balloon started from the ground and is rising at the rate of 50 km/h. At this rate what height will they be at when they are at the same height?