<img src="https://tex.z-dn.net/?f=x%5E%7B2%7D%20%2B%2013x%3D%20-6" id="TexFormula1" title="x^{2} + 13x= -6" alt="x^{2} + 13x= -6

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son4ous [18]

3 years ago

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Mathematics

1 answer:

HACTEHA [7]3 years ago

6 0

Answer:

Is that a magic spell??

Step-by-step explanation:

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The local deli charges a fee for delivery. On monday, they delivered two dozen bagels to an office at a local cost of $8. On Tue

aev [14]

Answer:

2b+f=8; 3b+f=11
b=3, f=2

Step-by-step explanation:

The problem statement defines the variables and gives the relations ...

2b + f = 8 . . . . total cost on Monday

3b + f = 11 . . . . total cost on Tuesday

Subtracting the first equation from the second, we get ...

(3b +f) -(2b +f) = 11 -8

b = 3 . . . . . simplify

Substituting this into the first equation, we can solve for f

2·3 +f = 8

f = 2 . . . . . . . subtract 6

Bagels cost $3 per dozen; the delivery fee is $2.

4 0

3 years ago

So that you're coming purpose of each circle and find the radius and diameter below the circle

oksano4ka [1.4K]

Answer:

The radius is given, so the radius is = 10

The radius is doubled to be a diameter, so (10 + 10) = 20 is your diameter

And to solve for circumference, your formula is;

C = 2πr

Where 'r' represents the radius, and 'π'(pi) is 22/7 or 3.14.

Plug in your values:-

C = 2πr

C = 2(3.14) x 10

C = 6.28 x 10

C = 62.8, so your circumference is 62.8.

Your radius is half of your diameter, so,

D/2 = R

D = diameter

R = Radius

49/2 = 24.5 is your radius.

Your diameter is given, so the diameter is 49.

Use the formula we applied for circumference in our other problem;

C = 2πr

C = 2(3.14) x 24.5

C = 6.28 x 24.5

C = 153.86, so 153.86 is your circumference.

3 0

2 years ago

Customers of a phone company can chose between two service plans long distance calls. The first plan has $15 monthly fee and cha

stich3 [128]

Im not sure but I would seem that the first plan is much better due to the cost. I know this is not an answer but just saying and there just a $0.004 diference wich is practicly the same

6 0

3 years ago

Which equation shows the result of 42 divided by 15?

KatRina [158]

Answer:

42=2×15+12

Step-by-step explanation:

2×15=30

therefore 30+12=42

5 0

4 years ago

I need help please!!! My teacher doesn't teacher and she has asked us to do a problem I don't know how to do it. Can somebody ex

ra1l [238]

Using exponential functions, it is found that:

a) Since the amount of caffeine will be less than 50 mg, the patient will be ready for the blood test by 6 a.m.

b) The patient could have ingest 231 milligrams of caffeine.

A decaying exponential function is modeled by:

$A(t) = A(0)(1 - r)^t$

In which:

A(0) is the initial value.
r is the decay rate, as a decimal.

In this problem:

Caffeine metabolize at a rate of 13% per hour, hence $r = 0.13$ .

Then:

$A(t) = A(0)(1 - r)^t$

$A(t) = A(0)(1 - 0.13)^t$

$A(t) = A(0)(0.87)^t$

Item a:

The coffee cup contains 150 milligrams of caffeine, hence $A(0) = 150$ .

At 6 a.m., it is 8 hours after drinking the coffee, hence we have to find A(8).

$A(t) = A(0)(0.87)^t$

$A(8) = 150(0.87)^8$

$A(8) = 49.2$

Since the amount of caffeine will be less than 50 mg, the patient will be ready for the blood test by 6 a.m.

Item b:

This A(0), considering A(11) = 50, hence:

$50 = A(0)(0.87)^{11}$

$A(0) = \frac{50}{(0.87)^{11}}$

$A(0) = 231$

The patient could have ingest 231 milligrams of caffeine.

A similar problem is given at brainly.com/question/25537936

3 0

2 years ago