For this one, you have to find the rate that he's burning calories. 75 calories in 15 minutes. So you divide 75/15 to get the per minute ratio. 75/15=5 so he burns 5 calories every minute. If he kept that up for 25 minutes, he would burn 5*25=125 calories
x^2 -3x+11=0
using the determinant
b^2-4ac
(-3)^2 -4(1)*11
9 -44
-36<0 it has no real solutions
Step-by-step explanation: