x * 2-8
Less than means to put it at the end, and twice the value means to mulyiply by 2.
Answer:
One pound costs 1.26, two costs 1.47, three costs 1.68, and four costs 1.89. So we calculate how much it increases in each pound.
1.26 + 21 = 1.47
1.47 + 21 = 1.68
1.68 + 21 = 1.89
1.89 + 21 = 2.10
2.10 + 21 = 2.31
2.31 + 21 = 2.52
2.52 + 21 = 2.73
8 pounds cost: 2.73
So I pay $ 2.73 for 8 pounds.
1 inch = 2.54 centimeters. this is a ratio.
expression: x inches * _2.54 centimeters_ = # of centimeters in x inches
1 inch
the reason the 1 inch is in the denominator is to cancel out the inches for x so that you are only left with centimeters.
estimate: 12 inch * _2.54 centimeters_ = 30.48 centimeters.
1 inch
The north displacement and the east displacement can be viewed as simply the legs of a right triangle and the distance between them is just the magnitude of the hypotenuse so:
h^2=x^2+y^2, where h is the distance between the two points, x is the easterly distance and y is the northerly distance....
h^2=.8^2+.6^2
h^2=.64+.36
h^2=1
h=1
So they are one mile apart from each other.