Yoko needs to buy some pencils brand a has a pack of 28 pencils for 4.19 brand b has a pack of 72 pencils for 9.12 find the unit price for each brand

How do i do this? i don’t understand

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

Eric has challenged himself to walk 24,000 steps in 4 days. if eric walks the same number of steps each day, which function represents the number of steps eric still needs to walk to reach his goal with respect to the number of days since he started his challenge? a. y = 8,000x − 24,000 b. y = -8,000x + 24,000 c. y = 6,000x − 24,000 d. y = -6,000x + 24,000