1km = 1000m
1hr = 3600sec
Do proportions:
1km / 1000m = 15km / x
15000m = x
1hr = 3600sec
15000/3600 = 4.2m per second
Choice 4
To find this, first we have to find the square root of 200, which is about 14.14
Now we multiply 14.14 * 4 = 56.56
So Rae will need about 56.56 feet of fencing to surround the garden.
To do this, add the equations together like this,
3x + 4y = 2 plus
4x - 4y = 12
-x = 14
Multiply the negative sign to both sides because the x cannot be a negative.
x = -14
Now plug in -14 for a x value in one equation, like this to get the y value:
3(-14) + 4y = 2
-42 + 4y = 2
Add 42
4y = 44
y = 11
Your x and y values are:
x = -14
y = 11
2/3 of 1 1/2 = 1 quart blue paint
5/6 of 3 3/5 = 3 quarts red paint
1 quart blue paint + 3 quarts red paint = 4 quarts purple paint