Asubmarine was situated 800 feet below sea level. if it goes 450 feet up towards the surface, goes back down 100 feet and then goes up again 210 feet, what is the submarine's new position? first to answer gets the brainliest !

Ineed i been stuck on this question since yesterday

Beth divided 9 ounces of her granola recipe into 4 equal-sized amounts. she placed the amounts into individual bowls. the fraction 9/4 represents the number of ounces of granola in each bowl. which other number represents the amount of granola beth has in each bowl? (a) 1 1/4 (b) 2 1/4 (c) 1 3/4 (d) 3 3/4 i need !

15 there is a line that includes the point 0,10 and has a slope of 7/4. what is it’s equation in slope intercept form