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laila [671]
4 years ago
15

Brian Was thinking of a number. Brian adds 8 to it, then doubles it and gets an answer of 16.4. What was the original number?

Mathematics
2 answers:
nikklg [1K]4 years ago
4 0

Answer:

0.2

Step-by-step explanation:

Let that number be n

Adds 8: n+8

Then doubles: 2(n+8)

2(n+8) = 16.4

n+8 = 8.2

n = 0.2 or ⅕

viva [34]4 years ago
3 0

Answer:

The number is 0.2

Step-by-step explanation:

Write an equation for it:

Say that the number was called x

2(x +8) =16.4

Brain added 8 to the number (x) and then doubled it which is the 2

Times out the brackets 2x + 16 = 16.4

Take away 16 from both sides

2x = 0.4

0.4 / 2 = 0.2

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How do you write 0 to the power of 2 on a keyboard and what does is the answer to it?
just olya [345]

Answer:

0^2

Step-by-step explanation:

i think it will be 0 only

6 0
3 years ago
Read 2 more answers
Two lines L1 and L2 pass through the point of intersection of 2y=x-13 and 3y+x+12=0. L1 passes through P(-4,-7) and L2 is perpen
alexgriva [62]

Answer:

84°

Step-by-step explanation:

1. <u>point of intersection of 2y=x-13 and 3y+x+12=0</u>

x = 2y + 13   ==> 3y + (2y+13) + 12 = 0   ==>  5y + 25 = 0  ==> y = -5

x = 2*(-5) +13 = 3

point of intersection: (3 , -5)        L1: pass (3 , -5) and (-4 , -7)

slope of L1 = (-7 - -5)/(-4-3) = -2 / -7 = 2/7

L2 pass (3 , -5) perpendicular to 2x-5y=4

2x-5y=4  ==> y = 2/5 x - 4  slope = 2/5  

so slope of L2 = -5/2

angle Θ between two slopes: tan Θ = | (m2-m1) / (1 + m1*m2)|

==> = | (-5/2 - 2/7) / (1 + -5/2*2/7) | = |(-39/14) / (4/14) | = |- 39/4| = 39/4 = 9.75

Θ = 84°

6 0
3 years ago
Create a proportion using the form %/100 = is/of to represent the following word problem. 15 is 1 1/2% of what number?
Tema [17]
Let the required number be x, then to create a proportion using the form
\frac{\%}{100} = \frac{is}{of}

Thus, let 15 be 1 \frac{1}{2} \% of x, then
\frac{1 \frac{1}{2}}{100} = \frac{15}{x}  \\  \\  \frac{ \frac{3}{2} }{100} =\frac{15}{x} \\  \\ \frac{3}{2}x=1,500 \\  \\ x= \frac{1,500\times2}{3} =1,000

Therefore, 15 is <span>1 \frac{1}{2} \% of</span> 1,000
5 0
3 years ago
I will give brainliest to whoever gets it right
DerKrebs [107]

Answer: x + 27 = 17

Step-by-step explanation:

4(x+3) = 4x + 12

3(5-x) = 15 - 3x

4x-3x+12+15

x+27

4 0
3 years ago
Which of the following illustrates the truth value of the given statements? a plane has at least three noncollinear points, and
Marysya12 [62]
I think it's the first choice. T and F = F. hope this helps :D

7 0
4 years ago
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