You have a bill of $100. find a 18% tip?
2 answers:
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Answer:
4.57 hours
Step-by-step explanation:
The equation is used.
since the time is to be found, 242 miles is divided by 53 miles/hr which gives 4.566 hours so if you round it up. It will be 4.57 hours or 4.6 hours.
Answer:
1.67 hours
Step-by-step explanation:
Let the original speed of Jonathan = units/hr
Let the original time taken by Jonathan = hours
Let the distance = units
Formula for distance is given as:
Given that half the distance is covered by original speed.
Half the distance is covered by increasing the rate by 25%.
i.e. increased speed:
Hence, Time taken:
Distance traveled is half of the total distance:
Dividing (1) by (2):
Answer:
7. 183 in^2
8. 192.42 m^2
9. 239.4 ft^2
Step-by-step explanation:
7. The figure seems most easily seen as a trapezoid with a triangle removed. The trapezoid has bases of 26 and 14, and a height of 15. So, its area is ...
A = (1/2)(b1 +b2)(h) = (1/2)(26+14)(15) = 300 . . . . . . square inches
The triangle has a base of 26 and a height of 9, so an area of ...
A = (1/2)bh = (1/2)(26)(9) = 117 . . . . . . square inches
Then the shaded area is ...
300 in^2 -117 in^2 = 183 in^2
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8. The area of the donut can be found different ways. One way is to multiply the width of the shaded area (3.5 m) by the circumference of its centerline.
The centerline diameter is 21 m - 3.5 m = 17.5 m, so the circumference of that circle is ...
C = πd = π(17.5 m) = 17.5π m
Then the area of the shaded part is ...
(3.5 m)(17.5π m) = 61.25π m^2 ≈ 192.42 m^2
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9. As in problem 7, this can be treated as a parallelogram less a triangle. Here, we need to do a little work to find the area of the triangle.
The triangle of interest is a right triangle with hypotenuse 23.8 ft and one leg 21 ft. The Pythagorean theorem can be used to find the other leg:
h = √(23.8^2 -21^2) = √125.44 = 11.2
Then the area of the triangle is ...
A = (1/2)bh = (1/2)(21)(11.2) = 117.6 . . . ft^2
The area of the parallelogram (including the triangle) is ...
A = bh = (23.8 ft)(15 ft) = 357 ft^2
So, the shaded area is the difference ...
357 ft^2 -117.6 ft^2 = 239.4 ft^2
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<em>Comment on significant digits</em>
The area in problem 8 may be considered to be 192.325 m^2 if you are required to use 3.14 as the value for pi. Since that value is only good to 3 significant digits, it is quite pointless to report the answer to 6 significant digits when using that value. It is quite reasonable to use 192 m^2 for the answer, especially if you're required to round to whole numbers.
