What is 6.2 x 10^9 expressed as a decimal?

6,200,000,000

Step-by-step explanation: Since the exponent get smaller the number get bigger therefore don't get confused on whether it is a decimal because all whole numbers have a imaginary decimal.

∠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°