Big ideas math red:cc > chapter 3: 3.1-3.2 quiz > quiz 3. Question 9 please help!!!

Evaluate the expression for the given value of the variable 7a - 4a for a =8

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

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles