Can someone me understand ratios? like equivalent ratios? i don't remember learning that when i was in school. it's so i can explain it to my 11 year old son for his homework.

Reflect the point (7,0) across the y-axis

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )

Nicole purchased a container of cashews that weighs 5 kilograms. zion purchased a container of cashews that weighs 4,900 grams. how many more grams of cashews did nicole purchase?