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Minchanka [31]
3 years ago
9

Bryant just drank a cup of coffee to help him stay awake. The coffee had 52 milligrams of caffeine in it. If his body processes

20% of the caffeine every hour, how much will be left in 9 hours?
Mathematics
1 answer:
kkurt [141]3 years ago
4 0
Let c be caffeine, h be hours, mg milligrams:

c= 52 mg
1h =.2 (52)= 10.4

x/9h=10.4/1h

x= 93.6 mg

93.6- 52= 41.6 mg of caffeine will be left behind.











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Amiraneli [1.4K]
There are 4 quarterly inches in 1 inch so 4 x7=28 + 3 quarter in 3/4 so 31 quarter inches in all.
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What are the zeros of the function defined by the polynomial<br> x2 + 7x+12?
ryzh [129]

Answer:

x = -4 and -3

Step-by-step explanation:

factors to (x+4)(x+3)

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2 years ago
Brett works at a local pet store. When he works 4 hours he earns $36. When he works 9 hours he earns $81. What is the rate per h
Kitty [74]

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4 0
2 years ago
In ΔWXY, the measure of ∠Y=90°, XW = 53, YX = 28, and WY = 45. What is the value of the cosine of ∠X to the nearest hundredth?
kotegsom [21]

The value of ∠X = 58.11°, If ΔWXY, the measure of ∠Y=90°, XW = 53, YX = 28, and WY = 45.

Step-by-step explanation:

The given is,

                   In ΔWXY, ∠Y=90°

                        XW = 53

                         YX = 28

                        WY = 45

Step:1

             Ref the attachment,

             Given triangle XWY is right angled triangle.

             Trigonometric ratio's,

                              Cos ∅  = \frac{Adj}{Hyp}    

             For the given attachment, the trigonometric ratio becomes,

                              Cos ∅  = \frac{XY}{XW}.....................................(1)

             Let, ∠X = ∅

             Where, XY = 28

                         XW =  53

             Equation (1) becomes,

                                 Cos ∅  = \frac{28}{53}

                                 Cos ∅ = 0.5283

                                        ∅ = cos^{-1} (0.5283)

                                        ∅ = 58.109°

Result:

          The value of ∠X = 58.11°, If ΔWXY, the measure of ∠Y=90°, XW = 53, YX = 28, and WY = 45.

             

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3 years ago
Pls help me on this k12 question.
andrew-mc [135]

Answer: The answer is A, 132 units

Step-by-step explanation:

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