Which side measures can form a triangle? 1. 7 cm, 8 cm, 9 cm

2. 1.5 cm, 3 cm, 1.5 cm

3. 4 in, 2 in, 8 in

Thank you!

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Which of the following is the true for f(x) = 5cos

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