Dan is going to fix dinner. he turns on the oven. the graph shows the temperature over time. why does the graph not start at zero

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,

so, converting firstly the mixed fractions to improper fractions and then "adding".