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2 years ago

8

Sam has 3 1/3 books left to read for school. Sam read 2 7/8 books on Tuesday. Sam reads 2 7/12 times faster on weekday. How many

more books does Sam need to read?

1 answer:

oksano4ka [1.4K]2 years ago

5 0

3 1/3 it looks like a trick question cause he stater that same has that many books left to read

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A sample of tritium-3 decayed to 94.5% of its original amount after a year.

Zolol [24]

(a) If $y(t)$ is the mass after $t$ days and $y(0) = A$ then $y(t) = Ae^{kt}.$

$y(1) = Ae^k = 0.945A \implies e^k = 0.945 \implies k = \ln 0.945$

$\text{Then } Ae^{(\ln 0.945)t} = \frac{1}{2}A\ \Leftrightarrow\ \ln e^{(\ln 0.945)t} = \ln \frac{1}{2}\ \Leftrightarrow\ ( \ln 0.945) t = \ln \frac{1}{2} \Leftrightarrow \\ \\
t = - \frac{\ln 5}{\ln 0.945} \approx 12.25 \text{ years}$

(b)
$Ae^{(\ln 0.945) t} = 0.20 A \ \Leftrightarrow\ (\ln 0.945) t \ln \frac{1}{5}\ \implies \\ \\
t = - \frac{\ln 5}{\ln 0.945} \approx 28.45\text{ years}$

3 0

3 years ago

An original investment of $15,000 earns 7.25% interest compounded continuously. What will the investment be worth in 3 years? 30

horrorfan [7]

Answer:

$A = Pe^{rt}$

A = 1500 $e^{.0725 t}$

3 years = $18,644.48

30 years = $132,032.78

Step-by-step explanation:

5 0

3 years ago

Please help me I dnt get it

yuradex [85]

The answer would be A and E because the distance (d) is more than 125 miles

8 0

3 years ago

Robert gets a loan from his bank.

Goryan [66]

Answer:

£10,200

Step-by-step explanation:

Simple interest = principal × rate × time

Principal = £6000

Rate = 7% = 0.07

Time = 10 years

Simple interest = principal × rate × time

= £6000 × 0.07 × 10

= £4,200

Total = simple interest + principal

= £4,200 + £6,000

= £10,200

He would have to pay back a total of £10,200 in 10 years

5 0

3 years ago

H(x) = x2<br> j(x) = 2x2-5<br> find h(x) - j(x)

yKpoI14uk [10]

Answer:

Step-by-step explanation:

h(x) - j(x) => $x^2-(2x^2-5)$

The negative sign out in front of the set of parenthesis changes the signs of everything inside the parenthesis, so now we have, without parenthesis:

$x^2-2x^2+5$ which simplifies down to

$-x^2+5$

4 0

3 years ago