The half-life of a substance is how long it takes for half of the substance to decay or become harmless (for certain radioactive materials). the half-life of a substance is 8.6 days and there is an amount equal to 15 grams now. what is the expression for the amount a(t) that remains after t days, and what is the amount of the substance remaining (rounded to the nearest tenth) after 37 days? hint: the exponential equation for half-life is a(t) = a0(0.5)t/h, where a(t) is the final amount remaining, a0  is the initial amount, t is time, and h is the half-life.

x=-2

infinite number of lines, so there is an infinite number of equations.

step-by-step explanation:

there are an infinite number of line that passes through the point (-2,5)

x=-2   is one line that passes through the point

y = 5 is another line that passes through the point

(these two lines are perpendicular to each other).

since the number of   numbers are infinite and the slope is the ratio of two numbers,(change in y over change in x) we can have an infinite number of slopes.     our only condition is that it passes through the point (-2,5)

irrational, then, just means all the numbers that aren't rational. every integer is a rational number, since each integer n can be written in the form n/1. however, numbers like 1/2, 45454737/2424242, and -3/7 are also rational, since they are fractions whose numerator and denominator are integers.

step-by-step explanation: