scientist places 4 cells in a petri dish. Every hour, the cells divide in 2. How many cells are there after 9 hours?

Enter your answer rounded to the nearest whole number, such as: 425

2,048 cells

Step-by-step explanation:

Number of cells after 1 hour = 4 * 2 = 8

Number of cells after 2 hours = 8 * 2 = 16

Number of cells after 3 hours = 16 * 2 = 32

Number of cells after 4 hours = 32 * 2 = 64

Number of cells after 5 hours = 64 * 2 = 128

Number of cells after 6 hours = 128 * 2 = 256

Number of cells after 7 hours = 256 * 2 = 512

Number of cells after 8 hours = 512 * 2 = 1,024

Number of cells after 9 hours = 1,024 * 2 = 2,048

24

step-by-step explanation:

the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is

30% × 80 = 0.30 × 80 = 24