Prove, using the second derivative, that the general quadratic y = ax^2+bx+c, is:

a) always convex when a>0

b) always concave when a <0

The place value of 3 in 34,525

Multiply 5 (4n - 5) tell me how

What is 3x3 i also ned a explaintion

Which of the following would be severe punishment? (A) a slap on the wrist (B) going to jail (C) no television for a day (D) being told to be quiet

Nolan bought 26yds of rope the rope cost $2 per foot how much did he pay for the rope

Select the correct product. (x 2 4x 8) (2x - 1) 2x3 7x2 12x - 8 2x3 - 7x2 - 12x - 8 x2 6x 7 x2 8x - 8

There are 270 sixth grade students and 45 chaperones going on a field trip. How many students would go with each chaperone if divided equally?

Solve the equation to find a positive value of c: 32 + 42 = c2

Jessica went shopping for a new watch she found a watch that was originally priced at $50 on sale for $40 by what percent had the watch been marked down A. 10% B. 20% C. 25% D. 40%

What is the answer? Trying to figure out which way to start! 4 + (9x2) / (4-1) - 4