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marin [14]
3 years ago
9

Please help me out with math, I suck at it​

Mathematics
2 answers:
Ymorist [56]3 years ago
8 0

Answer:

-3

Step-by-step explanation:

you cross multiply, so -5×3, and 5×x

so then you'll get -15=5x, so you just solve for x and get -15/5 which is -3

I hope that makes sense lol

dalvyx [7]3 years ago
6 0

Answer:

-3

Step-by-step explanation:

i think it might be-3 because a negative and a negative equals a positive

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Answer:

A. y<-3

Step-by-step explanation:

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2 years ago
At your school, the building is 20 feet tall, a tree's height is 252 inches, and the flagpole is 6 yards high. Which of the thre
timurjin [86]
First, all the heights have to be converted to similar units, say feet.

Therefore,
Building= 20 feet
Tree = 252*0.083333 = 21 feet
Flagpole = 6*3 = 18 feet

The tallest of the three is the tree and thus should cast the longest shadow. However, it should be noted that at exactly noon when the sun is overhead, all the three will have equal length of shadow (that is, 0 feet long).
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Congruent triangles pls help
Harrizon [31]
Congruent triangle are the same shape and same size exactly
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3 years ago
A typical cup of coffee contains about 100 mg of caffeine and every hour approximately 16% ofthe amount of caffeine inthe body i
Over [174]

Answer:

a) \frac{dC}{dt} = rC

And for this case we can rewrite the model like this:

\frac{dC}{C} = r dt

If we integrate both sides we got:

ln C = rt + k

If we use exponentials for both sides we got:

C = e^{rt} e^k = C_o e^{rt}

For this case C_o = 100 mg and r = -0.16

So then our model would be given by:

C(t) = 100 e^{-0.16 t}

Where t represent the number of hours

b) C(5) = 100 e^{-0.16*5}= 44.9329

Step-by-step explanation:

Part a

For this case we can assume the proportional model given by:

\frac{dC}{dt} = rC

And for this case we can rewrite the model like this:

\frac{dC}{C} = r dt

If we integrate both sides we got:

ln C = rt + k

If we use exponentials for both sides we got:

C = e^{rt} e^k = C_o e^{rt}

For this case C_o = 100 mg and r = -0.16

So then our model would be given by:

C(t) = 100 e^{-0.16 t}

Where t represent the number of hours

Part b

For this case we can replace the value t=5 into the model and we got:

C(5) = 100 e^{-0.16*5}= 44.9329

7 0
3 years ago
The Jennings family paid $371.40 for the year for their cable service. If their payments were the same each month, how much was
liberstina [14]

Answer:

$30.95

Step-by-step explanation:

There are 12 months in a year. $371.40 divided by 12 gives us $30.95.

3 0
3 years ago
Read 2 more answers
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