The difference between two numbers is greater than the first number and the sum of
the two numbers is greater than 21. Find the system of inequalities representing the
given situation.

Step-by-step explanation:

let the numbers be x and y

x-y>x

or -y>0

or y<0

and x+y>21

or if we want to solve further then

y<0

and x+y>21

or y>21-x

or 21-x<y <0

so 21-x<0

or 21<x

or x>21

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.