Seven year old Sarah has 9 crayons; 3 blue, 1 red, 2 green and 3 yellow. a) In how many ways can she line up the crayons on her desk?

b) She is to pick up some of the crayons. How many different choices of some
crayons could she make?

c) How many choices are there if at least one green crayon should be included?

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 to the power of 2 - 4y- to the power of 2 -6 y +3)

Find the value of x to the nearest tenth. a. 4.5 b. 5.4 c. 6.3 d. 7.2