A) If 9 students sharpen 18 pencils in 2 minutes,Then if the time is halved, it will take twice as many men to sharpen 18 pencils.Hence it will take 18 students to sharpen 18 pencils in one minute B) y & 1/x. Then y = K/x where K is our constant of proportionality.Then K = yx. When x = -64 and y = -16 then K = -64 * -16 = 1024. Option DC) When x = 3 y = 8. So for an inverse variation K as calculated from B = 3 * 8 = 24.Then when K = 24 and y = 6; we have 24 = 6x. Hence x = 4. Option A
The area of a pyramid is the sum of area of the base and the area of slant triangles. The area of the base is 1.5 × 1.5 = 2.25 cm² The slant height of each triangle, s is 3 cm The area of the triangles = 1/2 × 1.5 × 3 × 4 = 9 cm² Therefore, the area of the pyramid =9 +2.25 = 11.25 cm²
