40-10=30 are compatible numbers
That's a trapezoid,
![A = \frac 1 2 (b+B)h](https://tex.z-dn.net/?f=A%20%3D%20%5Cfrac%201%202%20%28b%2BB%29h)
![A = \frac 1 2 (4+12) 4 = 32](https://tex.z-dn.net/?f=A%20%3D%20%5Cfrac%201%202%20%284%2B12%29%204%20%3D%2032)
Answer: 32
But say we didn't know the formula. We can chop out the 4 by 4 square and we have two 45/45/90 triangles side 4 left over, so two 4 by 4 squares,
A = 2(4)(4) = 32
We can think of this as 12 by 4 rectangle with two 4 by 4 right triangles chopped out:
A = 12(4) - 2(1/2)(4)(4) = 48 - 16 = 32
1 yard = 3 feet
Therefore Rachel ran 155*3 feet = 465 feet
465 > 327 therefore she is correct
The answer needs to be in mph, or "miles per hour", so let's convert "5 hours and 15 minutes" to pure hours (with no minutes attached)
Since there are 60 minutes in an hour, this means that 15 minutes = 15/60 = 1/4 of an hour (quarter of an hour). I'm going to convert the fraction 1/4 into decimal form 0.25; use a calculator or long division to compute this.
Therefore,
5 hours and 15 minutes = (5 hours) + (15 minutes)
5 hours and 15 minutes = (5 hours) + (0.25 hours)
5 hours and 15 minutes = (5+0.25) hours
5 hours and 15 minutes = 5.25 hours
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The car travels 183.75 miles (given) for 5.25 hours (value computed above). Use the formula shown below to find the speed or rate
speed = distance/time
s = d/t
s = 183.75/5.25
s = 35
Note: your math book might use "r" instead of "s".
So the speed of the car is 35 miles per hour