Select all that apply. which of the following are elements? o2 ca kf b

Ca and B

Explanation:

By definition, an element is the most basic substance that can't be simplified. Molecules are when two or more atoms of the same type of element join together. Compound is when two or more different elements join together. Following these definition, Ca (Calcium) and B (Boron) are elements. O₂ is a diatomic molecule while KF (Potassium Fluoride) is a compound.

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