Calcula el diámetro para una pista de carreras cuyo perímetro o circunferencia es 47.12 cm ayúdenme es para hoy y no lo entiendo y me pueden explicar el proceso de la división ​

In the surface area formula for cylinders which expressionrepresents the lateral area

Raj encoded a secret phrase using matrix multiplication. using a = 1, b = 2, c = 3, and so on, he multiplied the clear text code for each letter by the matrix to get a matrix that represents the encoded text. the matrix representing the encoded text is . what is the secret phrase? determine the location of spaces after you decode the text. yummy is the corn the tomato is red the corn is yummy red is the tomato

Parabolas y=−2x^2 and y=2x^2+k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.