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3 years ago

Please help ASAP really need this

Mathematics

1 answer:

Aleonysh [2.5K]3 years ago

3 0

Answer:

$21.79 + c \leq 25$

Joshua can spend up to 3.21 on a card.

Step-by-step explanation:

$21.79 + c \leq 25$ is the correct equation because Joshua is spending 21.79 on flowers, a certain amount on the card, and the maximum he can spend is 25. That is why you use the less than or equal to sign.

To solve, first subtract 21.79 from both sides to get: $c \leq 3.21$ . This means that Joshua can spend up to 3.21 on a card.

Hope it helps!

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3 years ago

Read 2 more answers

Please help!!!!

Irina18 [472]

Number of trees infected after t years:

The number of trees infected after t years is given by:

$f(t) = e^{0.4t}$

Question 1:

We have to find the number of years it takes to have 21 trees infected, that is, t for which:

$f(t) = 21$

Thus:

$e^{0.4t} = 21$

To isolate t, we apply the natural logarithm to both sides of the equation, and thus:

$\ln{e^{0.4t}} = \ln{21}$

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Thus, it will take 7.6 years for 21 of the trees to become infected.

Question 2:

We have to find the inverse function, that is, first we exchange y and x, then isolate x. So

$f(x) = y = e^{0.4x}$

$e^{0.4y} = x$

Again, we apply the natural logarithm to both sides of the equation, so:

$\ln{e^{0.4y}} = \ln{x}$

$0.4y = \ln{x}$

$g(x) = \frac{\ln{x}}{0.4}$

Thus, the logarithmic model is:

$g(x) = \frac{\ln{x}}{0.4}$

For an example of a problem that uses exponential functions and logarithms, you can take a look at brainly.com/question/13812761

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3 years ago

If 8lbs of apples cost 12.48, how much is 1lb of apples

prisoha [69]

Answer:

$1.56

Step-by-step explanation:

You have to divide the cost $12.48 and divide it with the 8lbs and it gives you $1.56, if your not sure that its the right answer than just multiply the answer with the 8lbs, your welcome!

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3 years ago

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3 years ago

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Answer:

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310

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3 years ago