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each base angle is 70°

Step-by-step explanation:

this is an isosceles triangle because two sides are equal which means two angles are equal

the left, right base angle is also 'x'

so, x + x + 40 = 180

2x = 140

x = 70

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870