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alukav5142 [94]
2 years ago
14

Helppppp please i need to know the answer right now! Thanks!

Mathematics
1 answer:
Ivenika [448]2 years ago
6 0

Answer:

f(7) - f(-7)

= (4 - 7^2) - ((-7)^3 - 2*(-7))

= -45 - (-329)

= 284

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Pleasantburg has a population growth model of P(t)=at2+bt+P0 where P0 is the initial population. Suppose that the future populat
yulyashka [42]

Answer:

The population will reach 34,200 in February of 2146.

Step-by-step explanation:

Population in t years after 2012 is given by:

P(t) = 0.8t^{2} + 6t + 19000

In what month and year will the population reach 34,200?

We have to find t for which P(t) = 34200. So

P(t) = 0.8t^{2} + 6t + 19000

0.8t^{2} + 6t + 19000 = 34200

0.8t^{2} + 6t - 15200 = 0

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

ax^{2} + bx + c, a\neq0.

This polynomial has roots x_{1}, x_{2} such that ax^{2} + bx + c = a(x - x_{1})*(x - x_{2}), given by the following formulas:

x_{1} = \frac{-b + \sqrt{\bigtriangleup}}{2*a}

x_{2} = \frac{-b - \sqrt{\bigtriangleup}}{2*a}

\bigtriangleup = b^{2} - 4ac

In this question:

0.8t^{2} + 6t - 15200 = 0

So a = 0.8, b = 6, c = -15200

Then

\bigtriangleup = 6^{2} - 4*0.8*(-15100) = 48356

t_{1} = \frac{-6 + \sqrt{48356}}{2*0.8} = 134.14

t_{2} = \frac{-6 - \sqrt{48356}}{2*0.8} = -141.64

We only take the positive value.

134 years after 2012.

.14 of an year is 0.14*365 = 51.1. The 51st day of a year happens in February.

So the population will reach 34,200 in February of 2146.

6 0
2 years ago
The Hoover Dam generates an average of about 11,506,000 kilowatt-hours of electricity per day.
OLEGan [10]

Answer:

161,084,000

Step-by-step explanation:

7 x 11,506,000 = 80,542,000

80,542,000 x 2 = 161,084,000

6 0
2 years ago
Find the angle measures given the figure is a rhombus
Inessa05 [86]

Answer:

we must be doing the same problems

Step-by-step explanation:

I need help on them as well

3 0
3 years ago
240 seventh graders and two-thirds of the students participate in after-school activities How many students participate in after
LekaFEV [45]

Answer:

160

Step-by-step explanation:

is there 240 seventh graders in total? If so all you have to do is:

240 x 2/3

which equals 160 seventh graders.

8 0
3 years ago
Please help! Ill give brianliest!
Rzqust [24]

Answer:

13x-8+7x+4+3x=180

23x. =184

X=. 8

JKL=7X+4

=60

KLJ=3x

=24

LJK=13x-8

=96

5 0
3 years ago
Read 2 more answers
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