Gabrielle's age is two times Mikhail's age. The sum of their ages is 30 . What is Mikhail's age?

If 1 km = 0.621 miles, how many miles are in a centimeter

Write the fraction or mixed number and the decimal shown by the model

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.