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Katen [24]
3 years ago
12

 m∠A = 42 and m∠C = 57. Find m∠B.A. 81 B. 99 C. 132 D. 147

Mathematics
1 answer:
faltersainse [42]3 years ago
5 0
A.
because the total distance of every triangle 180. Add the two other angles so 42+ 57 =99. Then you have to subtract those two combined angles to find the missing one from the total distance, which is 180. 180-99=81. the answer is A. 81
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Can you explain step by step for #15 and #16 I have a test on this tomorrow
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Answer:

15.

\left\{\begin{array}{l}x+y=50\\0.2x+0.1y=6\end{array}\right.

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Step-by-step explanation:

A chemist takes x ml of 20% saline and y ml of 10% saline. In total, he takes

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x + y = 50.

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\left\{\begin{array}{l}x+y=50\\0.2x+0.1y=6\end{array}\right.

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Substitute it into the second equation:

0.2(50-y)+0.1y=6\\ \\10-0.2y+0.1y=6\\ \\-0.1y=6-10\\ \\-0.1y=-4\\ \\y=40\\ \\x=50-y=50-40=10

7 0
2 years ago
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Answer:

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To check your work, you can add/subtract each term to see if you get 7c^2d-7c+4d-10

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6 0
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Read 2 more answers
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alexandr402 [8]

Answer:

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Step-by-step explanation:


6 0
2 years ago
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