Gawain sa pag katuto bilang 4: Gumuhit sa tatlong bagay na makikita sa loob ng inyong bahay na maiuugnay sa kontribusyon ng mga sinaunang kabihasnan at lipunan. Gawin ito sa isang malinis na bondpaper​

Did the universe cool off or get hotter as it expanded after the 'big bang"?

Sat no calculator section question in the picture

Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within an inch of the tailpipe mouth. technician a says that if the paper is vibrating due to a "puffing" output from the tailpipe, this signals a smoothly running engine. technician b says that if the paper is being drawn toward the tailpipe, this could indicate burned exhaust valves. who is correct? a. technician b b. both technicians a and b c. technician a d. neither technicians a or b