Which sentence could be used to describe the equation 105=78+y? the sum of 78 and a number is 105. the number 105 is more than 78. the sum of 105 and 78 is a number. seventy-eight is more than the number one hundred five.

For this case we must find the sentence that best describes the equation given by:

It is observed that at 78 a number is added, which can be any, and the sum results in 105.

So, the sentence that best fits is:

The sum of 78 and a number is 105

The sum of 78 and a number is 105

Option A

∠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°