Belle’s grandfather lives in a region where the temperature drops below 0°F at night. When Belle visited her grandfather, they hiked up a hill. Belle noticed that a lot of rocks had cracks in them. She also found quite a few rocks that had split into pieces. What most likely caused the rocks in this region to weather?

answer; /// the correct answer is evidence of the olmec civilization has been found in southern american in a hot steamy forest, archaeologists have found earthen artifacts at several sites that were evidence of the olmec civilization. these   artifacts were mounds,courtyards and pyramids build of stones, also on top of the mounds were many monuments made of stone, some of these stone structures are very large, they weigh as much as 44

c.) biotic: snails; abiotic: temperature climate

what the first or next guys says

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69