The population of a country has been increasing for several decades. in 1990, the population was about 242 million people. in 2014, the population was about 289 million people. determine the percent increase in the country's population during this time period.

To calculate percentage increase. Subtract old and new value. Then divide answer by old value then multiply by 100:

289 -242 = 47

47÷ 242 × 100 = 19.4% (rounded to 2 s.f)

step-by-step explanation:

the true ones are a b and d

center (1,3) with radius 6

step-by-step explanation:

we must complete the square to find the center and radius of the circle.

first make sure the x and y squared terms have 1 as their coefficients. we also make sure x and y terms together.

we now create space between the x and y terms with parenthesis.

we complete the square by taking the middle terms -2x and the -6y - divide each and square them.

we add the squares to both sides.

simplify.

and write the quadratics in factored form.

the center is (h,k) or (1,3). the radius is the square root of 36 which is 6.