A real image twice the size of an object is formed by a concave mirror when the mirror and the object were shifted the mirror formed become four times the size of the object find the focal length of the mirror if the image were to be shift by 24cm Hint; in the first position of the object U = V/F -1 apply this to the second position​

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

moisture is lackin, and organic acids are scarce.