Element x is a radioactive isotope such that every 12 years, its mass decreases by half. given that the initial mass of a sample of element x is 430 grams, how much of the element would remain after 15 years, to the nearest whole number?

answer:

127 is rational number.

step-by-step explanation:

the given number 127 is rational because it can be written as the quotient of two integers   (p and q) like shown below:

which can be represented as  

but if it is the square root of the same number , then it would be an irrational number since the square root of 127 would gives a decimal number that will keep going on and cannot be represented as a fraction.

answer:

x=25

step-by-step explanation: 25+50=75

answer:

  (-2, 5), (-2, -19), (5.2, 2.6)

step-by-step explanation:

you can add ±12 to either the x- or the y-coordinate, as was done in the first two answers above.

or, you can figure the side lengths of a triangle with hypotenuse 12 and add those to the coordinates. for example, a 3-4-5 right triangle multiplied by 2.4 will have side lengths of 7.2, 9.6 and a hypotenuse of 12. hence we can find one of your end points to be

  (-2+7.2, -7+9.6) = (5.2, 2.6)