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3 years ago

Determine which ratio forms a proportion with 7/2

Mathematics

2 answers:

SCORPION-xisa [38]3 years ago

7 0

You should multiply it by the same number such as 14/2 to 7/2. Otherwise, it simply does not work.

gizmo_the_mogwai [7]3 years ago

5 0

For determining proportional ratios, you have to multiply both the denominator and the numerator by the same number

Eg. 14/4 is proportional to 7/2 while 22/6 is not proportional to 7/2.

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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.

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2 years ago

Which steps are involved in multiplying fractions??

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3 years ago

Male and female high school students reported how many hours they worked each week in summer jobs. The data is represented in th

KATRIN_1 [288]

Answer:

I'm 99% sure the answer is A

Step-by-step explanation:

8 0

3 years ago

11. The perimeter of a rectangular garden is 96 ft. The length is five times the width. Find

asambeis [7]

Answer:

Length =40 ft.

width. = 8 ft.

Step-by-step explanation:

If The length is five times the width , then

width = w

length = 5w

Perimeter of Rectangle = 2( l+b)

2(5w+w)= 96

2( 6w) = 96

12 w= 96

w = 96/12

w= 8ft.

length = 5(8)

= 40 ft

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For the graph, locate the x-intercept and y-intercept.

alexgriva [62]

X-intercept = -4
y-intercept = -8

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