1what properties of a star are needed to calculate the star's luminosity? a. size and apparent brightness b. mass and distance to the star. c. temperature and diameter of the star d. apparent brightness and distance to the star. 2.which cool and bright stars are located in the upper right of the h-r diagram? a. red giants b. neutron stars c. white dwarfsd. main sequence

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

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form