Asquare is cut out of a copper sheet. two straight scratches on the surface of the square intersect forming an angle. the square is heated uniformly. as a result, the angle between the scratches

a) increases
b) decreases
c) stays the same
d) the answer depends on whether θ is an acute or obtuse angle.

(c) Stay the same

Step-by-step explanation:

Final angle will be same as initial angle. But length of lines will increase in both direction proportionally.

However any normal curve(closed or open ) will remain proportional to initial one. It is like a Zooming or magnifying of object.

i think it's b

step-by-step explanation:

because the graph is 2 above (0,0)

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490