What is the difference in average speed between two car, one that traveled 150 kilometers in 5 hours and the other that traveled 130 kilometers in the same time?

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant