Express this decimal as a fraction: 0.8

Maria donates a fixed amount, a, to a charity each month. if she donates $300 in 12 months, what is the equation for a? a. a + 300 = 12 b. a × 300 = 12 c. a × 12 = 300 d. a + 12 = 300 e. a + 32 = 100

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

Find the area of the regular hexagon if a side is 20 cm.