In an algebraic equation, you should have at least 2 variables: the independent and the dependent. The independent variable in this case, is the parameter that cannot be controlled - time. This is expressed in minutes using the variable x. The dependent variable is the parameter you want to measure - the distance expressed using the variable y. Since the problem states a parameter of distance in terms of 2 kilometers, y=2. Therefore, I think the choices would be about the amount of minutes it would take for Bradley to cover this distance. Assuming this is the case, then the answer would be:
2 = 2000 - 90x
90x = 2000-2
90x = 1998
x = 1998/90
x = 22.3 minutes
It would take 22.3 minutes for Bradley to cover the 2 kilometers so that he could get home.
Hello!
To find the area of a circle you use the equation

r is radius which is half the diameter
r = 2.6 / 2
r = 1.3
Put in the values you know

Square the number

The answer is

or ≈5.31
Hope this helps!
For this case, the first thing we are going to do is define variables.
We have then:
x: number of birthday party goozy bags
y: total weight
We then have the following equation:
y = 150x + 200
For y = 6200 we have:
6200 = 150x + 200
Clearing x:
x = (6200-200) / (150)
x = 40
Answer:
there are 40 goody bags inside the box
6/10 per day
6/10 x 5 days
6 x 5 = 30
30 / 10 = 3 miles in 5 days