Element X decays radioactively with a half life of 8 minutes. If there are 690 grams of Element X, how long, to the nearest tenth of a minute, would it take the element to
decay to 7 grams?
I need help please

a. the are of the rectangle is 18.25

b. 18.25 times two is 36.50

rae me : d

d) by the cross product property, ab^2 = bc multiplied by ad

step-by-step explanation:

we are given

in the given triangle abc

angle a is 90° and segment ad is perpendicular to segment bc

we can see that

triangle(abc) and triangle(abd) are similar because they have common side and same angle (90 degree)

so, triangles(abc) and abd are similar

since, they are similar

so, the ratio of their sides must be equal

we get

now, we can cross multiply

and we get

so, this could be step to prove it

step-by-step explanation:

the answer is 128