Find the perimeter of the triangle ABC A. 9 √84
B. 9 √2+√82
C. 18+ √82
D. None of the above

Can y’all explain it too please

From the beginning of the day the temperature rose 15 degrees so that by 4 pm it was 87 degrees. what was the temperature at the start of the day

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Triangle abc has side lengths: ab = 3.5  cm, bc = 2.4 cm, and ac = 4.2 cmδabc ≅ δhjkwhat is the length of side hj?