It is expected that 563 quadrillion thermal units of Btu (British thermal units) of energy will be consumed worldwide in 2015. In 2003, worldwide consumption was 421 quadrillion Btu. What is the expected rate of change in consumption from 2003 to 2015? A about 0.069 quadrillion Btu per year
B about 11.83 quadrillion Btu per year
C about 142 quadrillion Btu per year
D about 0.085 years per quadrillion B

With this one. will mark brainliest

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

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle