Question

Rachel is a microbiology student in Burger's college. She was doing a research on optimum temperature for the survival of different strains of viruses. She performed an experiment and studies showed that virus $A$ needs an optimum temperature of $-{30}^{\circ }\text{C}$ while virus $B$ needs an optimum temperature of $-{45}^{\circ }\text{C}$. The difference between the optimum survival temperatures of virus $A$ and virus $B$ (in degree celsius) is .

Answer 1

Optimum survival temperature of virus $A$ $=-{30}^{\circ }\text{C}$
Optimum survival temperature of virus $B$ $=-{45}^{\circ }\text{C}$

Difference between the optimum survival temperatures of virus $A$ and virus $B$ $=$ Optimum survival temperature of virus $A-$ Optimum survival temperature of virus $B$
$=-{30}^{\circ }\text{C}-(-{45}^{\circ }\text{C})$
$=-{30}^{\circ }\text{C}+{45}^{\circ }\text{C}$
$={45}^{\circ }\text{C}-{30}^{\circ }\text{C}$
$={15}^{\circ }\text{C}$

Hence, the difference between the optimum survival temperatures of virus $A$ and virus $B$ is $\underset{–}{{15}^{\circ }\text{C}}$.