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719563mercy
17.09.2019 •
Mathematics
The sum of the three numbers is 69. if the second number is equal to the first diminished by 8, and the third number is 5 times the first. what is the numbers? if x represents the first number, then which of the following equations could be used to solve the problem?
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Ответ:
a=b+8
b=a-8
c=a/5
a is 11 (3+8= 11 which is a)
b is 3 (11-8=3 which is b)
c is 55. (11 x 5=55 which is c)
Ответ:
The side x is an hypotenuse side to one of the right triangles formed by
altitude of the given triangle that has solid lines.
x is approximately 31.812
Reasons:
The figure shows a triangle with an altitude that forms two triangles inside
the main triangle.
By Pythagoras's theorem, we have;
For the right triangle on the left;
22² = h² + 16²
h² = 22² - 16² = 228
h² = 228
h = √228 = 2·√57
h = 2·√57
In the right triangle to the right, we have;
The length of the top base, b = 44 - 16 = 28
The square of the hypotenuse, x² = h² + b²
∴ x² = 228 + 28² = 1012
x = √(1012) = 2·√253
x = 2·√253 ≈ 31.812
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