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3 years ago

15

Evaluate −3x+5y when x=16 and y=14. Write your answer as a fraction in simplest form.

1 answer:

disa [49]3 years ago

5 0

To answer this, you insert 16 in for X to get 48. Since there is a negative sign, 48 becomes -48. Then, replace Y with 14 to get 70. You are left to solve -48 + 70. I don't know why you would need a fraction, but if you do just put (answer)/1

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Scientists studying biodiversity of amphibians in a rain forest have discovered that the number of species is decreasing by 2% p

kupik [55]

Answer:

Select the correct answer.

Scientists studying biodiversity of amphibians in a rain forest have discovered that the number of species is decreasing by 2% per year. There are currently 74 species of amphibians in the rain forest. Which logarithmic function models the time, , in years, it will take the number of species to decrease to a value of n?

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Step-by-step explanation:

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Find the center and radius of the circle with equation (x + 3)^2 + (y – 6)^2 = 100.

Sonja [21]

Answer:

center (-3,6)

radius(r) 10

Step-by-step explanation:

The center-radius form (it is really called standard form) of a circle is:

$(x-h)^2+(y-k)^2=r^2$

where $(h,k)$ is the center and $r$ is the radius.

Compare the following:

$(x-h)^2+(y-k)^2=r^2$

$(x+3)^2+(y-6)^2=100$

You should see the following:

$-h=3$

$-k=-6$

$r^2=100$ .

$-h=3 \text{ implies }h=-3$ .

$-k=-6 \text{ implies } k=6$ .

$r^2=100 \text{ implies } r=\sqrt{100}=10$ .

So the center is (-3,6) and the radius is 10.

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3 years ago

Erica and tim each use their cell phones to send texts and make phone calls. Erica sent 18 texts and made 6 calls today. Tim sen

Karolina [17]

Answer:

Erica has 6 more text then Tim and 2 more calls then Tim.

Step-by-step explanation:

What i did was 18-12 because those are both text and that was 6 so Erica has 6 more

Then i did 6-4 =2 and those where both of the calls so Erica has 2 more calls then Tim.

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Answer:

D

Step-by-step explanation:

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4 years ago