Find the ages of the people and tree

callum is five years younger than eilidh caitlin is 15 years older than eilidh. the sum of their ages is 31. ewan has a tree in his garden which is seven times old as he is their ages add up to 352

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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.  

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.

Talia took the bus from her home to the bank and then walked back to her home along the same route. the bus traveled at an average speed of 40 km/h and she walked at an average speed of 5 km/h. to determine the time, x, that it took talia to walk home, she used the equation 40(0.9 – x) = 5x. the time of trip 2 is hours. the distance of trip 1 is km.