Modern medical advances might mean people could live 200 years. in 2009,, the life expectancy is about 80 years. assume that, due to modern advances, life expectancy gains 5.7 years every decade. from 2009, in how many years would humanity achieve a life expectancy of 110 years?

50 years

Step-by-step explanation:

Let x be the number of decades after 2009 and y be the life expectancy ( in years ) after x decades,

∵ life expectancy gains 5.7 years every decade,

If In 2009, the life expectancy is about 80 years.

So, the life expectancy after x decades,

y = 80 + 5.7x

If y = 110 years,

∴ 110 = 80 + 5.7x

⇒ 110 - 80 = 5.7x

⇒ 30 = 5.7x

⇒ x = = 5.26315789474 ≈ 5

Hence, after 5 decades or 50 years since 2009 the life expectancy would be 110 years.

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq

hey pal. the answer is b plz mark as brainliest