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jok3333 [9.3K]
3 years ago
15

2x + 3y = 13 y = 3x + 8

Mathematics
1 answer:
kumpel [21]3 years ago
6 0

Step-by-step explanation:

2x+3(3x+8)=13 y=3x+8

2x+9x+24=13 y=3(-1)+8

11x+24=13 y= -3+8 =8-3

11x=13-24 y=5

11x/11= -11/11

x= -1

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Help me asap you guys i need help
Thepotemich [5.8K]

Hi there! :)

Answer:

\huge\boxed{C}

To simplify the process, convert each given weight into standard notation:

Lion:

1 * 10^{5} = 1 * 100000 = 100,000 g

Ant:

2 * 10^{-3}  =  2* 0.001 = 0.002

Divide the ant's weight from the lion's weight:

100000 / 0.002 = 50,000,000

Convert to scientific notation: (use # of zeros to determine exponent)

50,000,000 = 5 * 10^{7}

Therefore, the correct answer is C.

5 0
3 years ago
The antibiotic clarithromycin is eliminated from the body according to the formula A(t) = 500e−0.1386t, where A is the amount re
PolarNik [594]

Answer:

Time(t) = 11.61 hours (Rounded to two decimal place)

Step-by-step explanation:

Given: The antibiotic  clarithromycin is eliminated from the body according to the formula:

A(t) = 500e^{-0.1386t}                 ......[1]

where;

A - Amount remaining in the body(in milligram)

t - time in hours after the drug reaches peak concentration.

Given: Amount of drug in the body is reduced to 100 milligrams.

then,

Substitute the value of A = 100 milligrams in [1] we get;

100= 500e^{-0.1386t}

Divide both sides by 500 we get;

\frac{100}{500}=\frac{ 500e^{-0.1386t}}{500}

Simplify:

\frac{1}{5} = e^{-0.1386t}

Taking logarithm both sides with base e, then we have;

\log_e (\frac{1}{5})= \log_e (e^{-0.1386t})

\log_e (\frac{1}{5})=-0.1386t         [ Using \log_e e^a =a ]

or

\log_e (0.2)=-0.1386t

-1.6094379124341 = -0.1386t

 [using value of \log_e (0.2) = -1.6094379124341 ]

then;

t = \frac{-1.6094379124341}{-0.1386}

Simplify:

t ≈11.61 hours.

Therefore, the time 11.61 hours(Rounded two decimal place) will pass before the amount of drug in the body is reduced to 100 milligrams


6 0
3 years ago
If y varies directly with x, and y = 18 when x = 4, what is the constant of proportionality?
GREYUIT [131]
Y is directly proportional to x and therefore takes the form y=kx where k is the constant of proportionality.

Dividing both sides by x for the given values, k becomes 18/4 = 4.5
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3 years ago
Kate is 11 45
avanturin [10]
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Trevor was paid $960 last week for working 40hours. What is Trevor's hourly pay rate before taxes?
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He gets paid 24 dollars an hour 960/40=24
4 0
3 years ago
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