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katen-ka-za [31]
3 years ago
10

the concentration, in parts per million, of a type of antibiotic in a human’s bloodstream after h hours can be modeled by the po

lynomial function c(h) = -0.09h2 3.5h 8. what is the concentration of the antibiotic after 3 hours?
Mathematics
1 answer:
lilavasa [31]3 years ago
8 0
17.9ppm after 3 hours
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-5 1/2 + 6 3/4 + (-4 1/4)
V125BC [204]

Answer:

-3

Step-by-step explanation:

-5 1/2 + 6 3/4 - 4 1/4

= 1 1/4 - 4 1/4

= -3

8 0
2 years ago
Esteban bought a new stove for $986 on his credit card. He used the stove for eleven years before replacing it. The stove cost h
vivado [14]

Answer:

b) $2,166

Step-by-step explanation:

4 0
2 years ago
A restaurant adds a 20% tip to the bills of parties of 6 or more people. Suppose a server waits on five such tables. The bill
castortr0y [4]

Answer:

$218.70

Step-by-step explanation:

You need to first convert the percentage to the decimal.

20% = 0.2

Now, you need to find 20% of each bill by multiplying each bill by 0.2.

0.2(185.45) + 0.2(205.20) + 0.2(195.05) + 0.2(245.80) + 0.2(262.00)

Because of the distributive property, you can add up the bills and multiply the sum by 0.2.

0.2(185.45 + 205.20 + 195.05 + 245.80 + 262.00)

0.2(1093.50)

218.7

The waiter made $218.70 in tips.

4 0
2 years ago
3. Mrs Green bakes muffins.
Sphinxa [80]

Answer:

85%

Step-by-step explanation:

Monday:

200 x 0.70 = 140

200 - 140 = 60

Tuesday:

400 x ? = 60

400 x 0.85 = 340

400 - 340 = 60

8 0
3 years ago
Ms. Hernandez gave her students a math test
emmainna [20.7K]

Answer:

85-86%

Step-by-step explanation:

Make it an equation

You want to find the percent out of a hundred, so 42 is 100 since it is all of the questions and 36 is the unknown percent X

36/42 = X/100

36             X

42             100

Cross multiply

Do math and solve for X

36 x 100 = 42 x X

3600=42X

X=85.71

7 0
2 years ago
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