If the formula that represents the amount of Diamond Dirt in a creature's body is given by D(t)=41⋅(1/10)^t, what is the half-life of Diamond Dirt?

Use the distributive law to multiply. 3(4x + 5y + 6)

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

Y=(x+3)(x-4)(x+1)^2 sulutions? multiplicity?