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3 years ago

Jeans are $20 for 2 pairs. Kerry spent $40 on jeans.How many pairs did she buy?

Mathematics

2 answers:

stiks02 [169]3 years ago

7 0

Kerry bought 2 pairs of jeans

Leona [35]3 years ago

5 0

Answer:Kerry would have bought 2 pairs of jeans

Step-by-step explanation:

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Solve for c 4(3+c)+c=c+4

Sonja [21]

Answer:

c = -2

Step-by-step explanation:

Given equation is :

4(3+c)+c=c+4

12 + 4c + c = c + 4

12 + 4c = 4 [dividing by 4]

3 + c = 1 [adding and subtracting 3]

c = -2

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3 years ago

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solniwko [45]

Answer:

The answer is A.

Step-by-step explanation:

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2 years ago

A(b) is a function A. True B. False

alexdok [17]

The answer is a. true

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2 years ago

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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

2 years ago

PLEASE HELP

olasank [31]

The recipe calls for 3.25 cups of flour and we want to use 0.25 of that. We can multiply the two numbers together to get 0.25 of 3.25 cups.

3.25 * 0.25 = 0.8125 cups

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3 years ago

Jeans are $20 for 2 pairs. Kerry spent $40 on jeans.How many pairs did she buy?​

Jeans are $20 for 2 pairs. Kerry spent $40 on jeans.How many pairs did she buy?