Biết n= 100; f=0,25. khi đó độ chính xác của phép ước lượng tỉ lệ vs độ tinh cậy 95% là?

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?