A. 320 km in 5 hours is a rate of per hour. b. 48 books bought for $360 is at the rate of per book.
c. If 900 litres of water flows through a tap in 2 hours, it is the rate of per minute.
d. Richard works for 10 hours and is paid $145. His rate of pay is per hour.
e. 5kg of peas cost $12.58, which equals per kg.

a. 64

b. 7.5

c. 7 min 5 sec

d. 14.5

e. 2.52

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

step-by-step explanation: yes