Half-Life problem The half-life of a certain radioactive
substance is 29 years. How long does it take
for a 50 gram sample to decay to only 10
grams?

b mark me branliest thx

step-by-step explanation:

94

step-by-step explanation:

average the numbers and use a variable to figure out the minimum to get a 90.

(79+94+91+92+x)/5=90

x = 94

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a