What is value of x and y if it's a right triangle 45 degree angle and the segment opposite the hypotenuse is 7

The graph below could be the graph of which exponential function?

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

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