Heron's formula gives a method of finding the area of a triangle if the lengths of its sides are known. Suppose that a, b, and c are the1lengths of the sides. Let s denote one-half of the perimeter of the triangle (called the semiperimeter), that is, s =(a +b + c). Then the2area of the triangle is A = Vs(s - a)(s - b)(s - c).Find the area of an island in the form of a triangle if the sides of this triangle measure approximately 15 mi, 7 mi, and 9 mi.The area of the triangle is approximately(Do not round until the final answer. Then round to one decimal place as needed.) Working together, Rick and Juanita can complete a job in 6 hr. It would take Rick 9 hr longer than Juanita to do the job alone. How longwould it take Juanita alone? Round your answer to the nearest tenth, if necessary.О А. 6 hrО В. 15 hrО с. З hrO D. 9 hr

We’ll answer the first question since the exact one wasn’t specified. Please submit a new question specifying the one you’d like answered. Given that a=15, b=7, c=9 So the semiperimeter=s=12(a+b+c)=12(15+7+9)=15.5So the area of the triangle using the Heron's formula is:A=s(s-a)(s-b)(s-c)A=15.5(15.5-15)(15.5-7)(15.5-9)A=428.1875A=20.6926919467A≈20.7Answer: 20.7 mi2or 20.7 square mi