In 1900, the average life expectancy in the United States was 47.3 years. In 2015, the average life expectancy was 78.8 years. Calculate the percentage increase in life expectancy from 1900 to 2015

66.6%.

Step-by-step explanation:

We have been given that in 1900, the average life expectancy in the United States was 47.3 years. In 2015, the average life expectancy was 78.8 years.

We will use percent increase formula to solve our given problem.

Round to nearest tenth.

Therefore, the percentage increase in life expectancy from 1900 to 2015  is 66.6%.

option (a)

step-by-step explanation:

step 1:   take 2 number whose product equal to 25..

and sum of those two number are -10

step: 2 for example here if we take 5,5 are the number,,

5*5=25

and

5+5=10

but we need -10

so if we take   -5,-5

so -5*-5=25

and -5+(-5)=-10

s0

come the equation

replace -10x by these number

like -5x -5x+25

take common

x(x-5)-5(x-5)=0

(x-5)(x-5)=0

dont't really have enough info here but its likely

sss for the three sides being congruent ( its stands for side side side)

or

sas   for side angle side.   so a side is congruent and and angle and a side