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Roman55 [17]
3 years ago
11

3 1Evaluate the expression. 8​ 2​+ 3.8 – 10 x 2

Mathematics
1 answer:
kherson [118]3 years ago
8 0

Answer: 65.8

Step-by-step explanation:

First multiply 10 x 2=20

then you add 82 and 3.8 which is 85.8

then you subtract 20 from 85.8 and you get 65.8

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astraxan [27]

Answer:  THe correct option is (C) 15.

Step-by-step explanation:  We are given to find the length of SR in the right-angled triangle SRQ as shown in the figure.

Since RT is perpendicular to the hypotenuse SQ, so triangle RTQ and SRT are also right-angled triangles at angle RTQ and RTS respectively.

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Using Pythagoras theorem in triangle RTQ, we have

RQ^2=RT^2+TQ^2\\\\\Rightarrow RT=\sqrt{RQ^2-TQ^2}\\\\\Rightarrow RT=\sqrt{20^2-16^2}\\\\\Rightarrow RT=\sqrt{144}\\\\\Rightarrow RT=12.

Now, since RT is perpendicular to the hypotenuse of ΔRST, so we get

ST\times TQ=RT^2\\\\\Rightarrow RS\times 16=144\\\\\Rightarrow RS=\dfrac{144}{16}\\\\\Rightarrow RS=9.

Again, using Pythagoras theorem in right-angled triangle RST, we get

SR^2=RT^2+ST^2\\\\\Rightarrow SR=\sqrt{144+81}\\\\\Rightarrow SR=\sqrt{225}\\\\\Rightarrow SR=15.

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Option (C) is CORRECT.

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How do patterns help solve problems
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Step-by-step explanation:

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