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8090 [49]
3 years ago
13

Given the function f(x) = −2x2 + 4x − 7, find f(−4). −55 −7 9 25

Mathematics
2 answers:
11111nata11111 [884]3 years ago
5 0

-27 is the answer for f (-4).

kompoz [17]3 years ago
3 0

Answer:

-55

on edge

Step-by-step explanation:

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Find the half life of a substance which decays according to the function A(t)=600e^-0.05t, where t is time in days. Round to the
Pavel [41]

Answer:

14 days

Step-by-step explanation:

The half life of a substance is the time required until the object has only half of the inicial mass.

So, to find the inicial mass of the object, we use t = 0 in the equation A(t):

A(0) = 600*e^0 = 600

Half of this mass is 300, so we can use A(t) = 300 and then find the time:

300 = 600e^-0.05t

e^-0.05t = 0.5

ln(e^-0.05t) = ln(0.5)

-0.05t = -0.6931

t = 13.862 days

Rounding to nearest day, we have that t = 14 days

8 0
4 years ago
A mail-order catalog firm designed a factorial experiment to test the effect of the size of a magazine advertisement and the adv
Gwar [14]

Find the attachments for complete solutions

8 0
3 years ago
Sarafina and Katie have between $105 and $420 dollars to spend on jewelry for Christmas presents for their friends. If they buy
algol13

Answer:

66

Step-by-step explanation:

105+420=525   (Total Money)

7x3.25=22.75   (Cost of all bracelets)

8x11.74=93.92   (Cost of all necklaces)

93.92+22.75=116.67   (Cost of all Christmas presents)

525-116.67=408.33   (Total money - Cost of all Christmas presents)

408.33/6.15=66.39...   (Amount of necklaces)

since in real life you can only buy a whole number of things, you would round down 66.39 to 66. I hope this helped!

5 0
3 years ago
The inequality -15<-6 is given. divide both sides of the inequality by 3.
julia-pushkina [17]

9514 1404 393

Answer:

  your answer is correct

Step-by-step explanation:

It seems possible that the intent is for division by -3, which would give the result ...

  5 > 2

If you are asked to divide by 3, your answer is correct:

  -5 < -2

8 0
3 years ago
Line JK passes through points J(-4,-5) and K(-6, 3). If the equation of the line is written in slope-intercept form, y = mx + b,
Scilla [17]

Answer:

Line JK passes through points J(-4,-5) and K(-6, 3).

Line JK has form of y = mx + b

=> -5 = -4m + b

=>  3 = -6m + b

Subtract 2nd equation from 1st equation:

=> -8 = 2m

=> m = -4

Substitute back m = -4 into 1st equation:

=> -5 = -4(-4) + b

=> b = -21

Hope this helps!

:)

6 0
3 years ago
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