Estimate how many times larger 4 x 1015 is than 19 x 1012.

2000

Step-by-step explanation: The number with the larger power of 10 is greater than the number with the smaller power of 10.

first, 1015 is 103 (or 1000) times larger than 1012.

and, 4 is a little more than 1

5

of 19

so, to estimate 1

5

x 1000 = 200

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°