Which phrase is not a way to state the meaning of the expression y-7
2 answers:
Answer:
<h2>B. A number subtracted from 7 .</h2>Step-by-step explanation:
The given choices are
A. 7 less than a number
B. A number subtracted from 7
C. A number minus 7
D. The difference between a number and 7
The given expression is:
Remeber, variabels are called "a number" indicating its variability, because they are unknown values.
So, this expression can be written as: "7 less than a numer" or "the difference between a number and 7" or "a number minus seven".
Therefore, among the options, choice B doesn't represents the given expression, because "a number subtracted from 7" is equivalent to which is not the case here.
So, the right answer is B.
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Answer:
- angles: 31.42°, 31.42°, 117.16°
- legs: 23.79 m
Step-by-step explanation:
The base angles can be found from the definition of the tangent function:
tan(base angle) = height/(half-base length)
base angle = arctan(12.4/20.3) ≈ 31.418°
Then the apex angle is double the complement of this:
apex angle = 2(90° -31.418°) ≈ 117.164°
The base angles are 31.42°, and the apex angle is 117.16°.
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The leg lengths can be computed from the Pythagorean theorem applied to the altitude and the half-base length.
leg length = √(12.4² +20.3²) = √565.85 ≈ 23.789 . . . . meters
The length of the legs is about 23.79 m.
