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Andreyy89
3 years ago
10

Alex was thinking of a number. Alex adds 13 to it, then doubles it and gets an answer of 84.5. What was the original number?

Mathematics
2 answers:
ICE Princess25 [194]3 years ago
8 0
29.25 then add 13 then double it
Katarina [22]3 years ago
4 0

Answer:

42.25

Step-by-step explanation:

just divied 84.5 to 2 and you'll get the answer

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There are approximately 3.2 x 10^7 mosquitoes near each backyard pool. How many total mosquitoes are thre in a city with 6.7 x 1
dexar [7]

Answer:

Step-by-step explanation:

Alright, lets get started.

There are approximately 3.2 \times 10^7 mosquitoes near each backyard pool.

The city has total number of pools 6.7 \times 10^{12}.

So the total mosquitoes will be : 3.2 \times10^7 \times6.7\times 10^{12}

So the total mosquitoes will be : 21.44 \times 10^{19}

So the total mosquitoes will be : 2.144 \times 10^{20}  :   Answer

Hope it will help :)

3 0
3 years ago
Satellite dishes are shaped like parabolas to optimally revive signals. The cross section of a satellite dish can be modeled by
Anna11 [10]

The cross section of the satellite dish is an illustration of a quadratic function

The quadratic function that models the cross-section is y = 1/6(x^2 - 9)

<h3>How to determie the equation of the cross-section?</h3>

The given parameters are:

Width = 6 feet

Depth = 1.5 feet

Express the width the sum of two equal numbers

Width = 3 + 3

The above means that, the equation of the cross section passes through the x-axis at:

x = -3 and 3

So, we have:

y = a(x - 3) * (x + 3)

Express as the difference of two squares

y = a(x^2 - 9)

The depth is 1.5.

This is represented as: (x,y) =(0,-1.5)

So, we have:

-1.5 = a(0^2 - 9)

Evaluate the exponent

-1.5 = -9a

Divide both sides by -9

a = 1/6

Substitute 1/6 for a in y = a(x^2 - 9)

y = 1/6(x^2 - 9)

Hence, the quadratic function that models the cross-section is y = 1/6(x^2 - 9)

Read more about quadratic functions at:

brainly.com/question/1497716

7 0
2 years ago
Which is greater, 4.87 x 10^9 or 9.212 x 10^8? <br> please helpp
STatiana [176]

Answer: 4.87 x 10^9  is greater than 9.212 *10^8

Step-by-step explanation:

4.87 x 10^9  is greater than 9.212 *10^8 because it has the greater exponent.

4.87 * 10^9 =  4,870,000,000

9.212 *10^8= 921,200,000

4,870,000,000 > 921,200,000

6 0
3 years ago
Frações Algébricas - 3* caso <img src="https://tex.z-dn.net/?f=%5Cfrac%7Bx%2B1%7D%7B2x-4%7D%20%20%2B%20%5Cfrac%7Bx-1%7D%7B3x-6%7
Ulleksa [173]

Answer:

\dfrac{5x + 1}{6(x - 2)}

\dfrac{5x + 1}{6x - 12}

Step-by-step explanation:

Fatorizam-se os denominadores.

2x - 4 = 2(x - 2)

3x - 6 = 3(x - 2)

O minimo multiplo comum dos denominadores e

2(3)(x - 2)

\dfrac{x + 1}{2x - 4} + \dfrac{x - 1}{3x - 6} =

= \dfrac{3(x + 1)}{2(3)(x - 2)} + \dfrac{2(x - 1)}{2(3)(x - 2)}

= \dfrac{3(x + 1) + 2(x - 1)}{6(x - 2)}

= \dfrac{3x + 3 + 2x - 2)}{6(x - 2)}

= \dfrac{5x + 1}{6(x - 2)}

= \dfrac{5x + 1}{6x - 12}

4 0
3 years ago
An online bookstore charges $2 to ship any book. Cole graphs the relationship that gives the total cost x dollarars. Name an ord
Nonamiya [84]
(0,2) because you must start off at $2
6 0
3 years ago
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