Use the eigenvalue property to prove that the 2 x 2 Hessian matrix below is positive definite if and only if a + c > 0 and ac > b^2. You can use this property to help you with the remaining problems.

[a b
b c]

What is a rational number between 9.5 and 9.7

Answer asap ill give ! ’ a sample of radioactive material decays over time. the number of grams, y , of the material remaining x days after the sample is discovered is given by the equation y = 10(0.5)^x. what does the number 10 represents in the equation? a. the half-life of the radioactive material, in days b. the amount of the sample, in grams, that decays each day c. the time, in days, it will take for the samples to decay completely d. the size of the sample, in grams, at the time the material was discovered

On the first of each month sasha runs a 5k race she keeps track of her times to track her progress her time in minutes is recorded in the table