F y varies directly as x and z, and y = 4 when x = 6

Answer (datum point);

The correct answer is (a.) in the coming years, the reyes family will save money because solar power requires little maintenance, and the energy used is free.

Answer(apex)  ok i looked up two diff, sites both say the answer is a technological innovation that has allowed people to adapt to living in hot climates, plz check first good luck///

Ithink the answer is ,temperature,pressure, and chemical changethey are identified by texture,streak,and locationthere are three ways that metamorphic rocks can form contact, regional,and dynamic metamorphism good luck, all this came right outta of the book