Dans chaque cas, donne la valeur exacte
1 ) volume d'une boule de 0,4 dm de rayon.
2)aire d'une sphère de 24 cm de diamètre.
3) volume d'un ballon rond de 240 mm de diamètre.

Solve: 3x+y=6 4x-2y=18 show all work !

Follow these steps using the algebra tiles to solve the equation −5x + (−2) = −2x + 4. 1. add 5 positive x-tiles to both sides and create zero pairs. 2. add 4 negative unit tiles to both sides and create zero pairs. 3. divide the unit tiles evenly among the x-tiles. x =

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.