Plz help me get the right answer to these ASAP

Mathematics

2 answers:

Ghella [55]3 years ago

7 0

b ≥ - 16

given $\frac{1}{4}$ b ≥ - 4

multiply both sides by 4 to eliminate the fraction

b ≥ - 16

ASHA 777 [7]3 years ago

4 0

Answer:

Step-by-step explanation:

$\dfrac{1}{4}b\geq-4\qquad\text{multiply both sides by 4}\\\\4\!\!\!\!\diagup^1\cdot\dfrac{1}{4\!\!\!\!\diagup_1}b\geq(4)(-4)\\\\b\geq-16$

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olga55 [171]

I can't see how any of those formulas show exponential decay. (Did you type those correctly?)

The formula that will show the remaining amount correctly is:
ending amount = Bgng Amount / 2^n
where "n" is the number of haf-lives.

So, for example if half life = 4 hours and if we want to calculate the amount after 9 hours (that's 2.25 half-lives) then:
ending amount = Bgng Amount / 2^n
ending amount = 50 / (2^(9/4))
ending amount = 50 / 2^2.25
ending amount = 50 / 4.75682846 
ending amount = 10.5112 grams
Looking at the graph, we see that's about right.