Ara buys two items that cost d dollars each. she gives the cashier $20. which expression represents the change she should receive? question 8 options: a 20 - 2d b 20 - d c 20 + 2d d 2d - 20

Colby and jaquan are growing bacteria in an experiment in a laboratory. colby starts with 50 bacteria in his culture and the number of bacteria doubles every 2 hours. jaquan starts with 80 of a different type of bacteria that doubles every 3 hours. let x equal number of days. colbys experiment follows the model: a.) y=50*2^x b.) y=50*2^8x c.) y=50*2^12x jaquans experiment follows the model: a.)80*2^x b.)80*2^8x c.)80*2^12x

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

Lena reflected this figure across the x-axis. she writes the vertices of the image as a'(−2, 8), b'(−5, 6), c'(−8, 8), d'(−4, 2).