The equation used to calculate how much remains of a sample based on its half-life is y=a\cdot\left(\frac{1}{2}\right)^{\ frac{t}{h}}y=a⋅( 2 1 ​ ) h t ​ . A is the amount that you started with, t is the time that has gone by and h is how many half-lives have happened. Given that a sample is 50g that has a half-life of 20 years, how much of the sample remains after 15 years?

first one is a: renaming a fraction. second one is c: de-c

step-by-step explanation:

my explanation is that these were the answers on edg : )

i think the answer is 90 hope this

alright so i think for this one it would to draw it out. this may be hard for me to try and draw, but i will do my best on here:

        r

  /       |     \

notice how it forms 2 triangles inside one bigger triangle.

so if we know the angle spr is the same as psr that is saying the measure of angle p is the same as angle s. this means the big triangle psr is either isosceles or equilateral. in both cases, the triangle is perfectly symmetrical when split down the middle, which is in this case rq. because we know it is perfectly symmetrical on both sides, we know that the two triangles inside the bigger one are equal.