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3 years ago

Plssss help me my test is due is 30 minutes.

Mathematics

2 answers:

Anon25 [30]3 years ago

6 0

Answer:i think its 1.75

Step-by-step explanation

RUDIKE [14]3 years ago

3 0

Answer: 1.5

Step-by-step explanation:

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The concentration of dichlorodiphenyltrichloroethane (DDT - an infamous pesticide) in Lake Michigan has been declining exponenti

mojhsa [17]

Answer: A) $y=13e^{-0.1359t}$

B) H = 5.10

C) Yes

Step-by-step explanation: Exponential Decay function is a model that describes the reducing of an amount by a constant rate over time. Generally, it is written in the form: $y(t)=Ce^{rt}$

A) C is initial quantity, in this case, the initial concentration of DDT. To determine r, using the data given:

$y(t)=Ce^{rt}$

$2.22=13e^{13r}$

$e^{13r}=0.1708$

Using a natural logarithm property called power rule:

$13r=ln(0.1708)$

$r=\frac{ln(0.1708)}{13}$

$r=-0.1359$

The decay function for concentration of DDT through the years is $y(t)=13e^{-0.1359t}$

B) The value of H is calculated by $y=C(0.5)^{\frac{t}{H} }$

$2.22=13(0.5)^{\frac{13}{H} }$

$(0.5)^{\frac{13}{H} }=0.1708$

Again, using power rule for logarithm:

$\frac{13}{H} log(0.5)=log(0.1708)$

$\frac{13}{H} =\frac{log(0.1708)}{log(0.5)}$

$\frac{13}{H} =2.55$

H = 5.10

Constant H in the half-life formula is H=5.10

C) Using model $y(t)=13e^{-0.1359t}$ to determine concentration of DDT in 1995:

$y(24)=13e^{-0.1359.24}$

y(24) = 0.5

By 1995, the concentration of DDT is 0.5 ppm, so using this model is possible to reduce such amount and more of DDT.

8 0

3 years ago

2x-7=5x-10 what is the answer

My name is Ann [436]

Answer: x= 1

Step-by-step explanation:

Subtract 2x from both sides

−7=5x−10−2x

Simplify

7=3x-10

Add 10 to both sides

7+10=3x

Simplify

3=3x

Divide

x=1

If you have any questions let me know!

Hope this helps!!! Good luck!!! ;)

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4 years ago

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supposed the first friday of a new year is the fourth day of that year .will the year have 35 friday regardless of whether or no

inysia [295]

No there is 53 Friday's in a year

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4 years ago

Solve −8x ≤ 2. A. x ≥ −.25 B. x ≥ −.30 C. x ≤ −.25 D. x ≤ .25

4vir4ik [10]

The answer would be A because when you divide by a negative, it flips the sign.
Hope This Helps and God Bless!

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3 years ago

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A trapezoid and an isosceles trapezoid have different area formulas. True False

adelina 88 [10]

Answer:

false

Step-by-step explanation:

because its the top and bottom that are parallel, not the sides

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