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3 years ago

When three times a number is subtracted from 13 the result is 5 plus the number what is the number?

Mathematics

1 answer:

Vladimir79 [104]3 years ago

8 0

Answer:

• let the number be x

• Mathematical interpretation and manipulation of the above statement:

$\hookrightarrow \: { \tt{13 - 3x = 5 + x}}$

• solve and simplify:

${ \tt{x + 3x = 13 - 5}} \\ \\ { \tt{4x = 8}} \\ \\ \dashrightarrow \: { \boxed{ \rm{ \: x = 2 \: }}}$

Answer: The number is 2

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The graph of which function has an axis of symmetry at x = 3? f(x) = x2 3x 1 or f(x) = x2 – 3x – 3 or f(x) = x2 6x 3 or f(x) = x

Wittaler [7]

For
ax^2+bx+c
the axis of symmetry is -b/2a

first one
-3/2=3, nope

2nd one
3/2=3? nope

3rd one
-6/2=3? nope

fourth
6/2=3? yes
answer is last one or
f(x)=x^2-6x-1

6 0

3 years ago

Read 2 more answers

Please help! Brainliest

Mama L [17]

1.301

Explanation:

Given:

$\log_a5 \approx 0.699$ and $\log_a2 \approx 0.301$

Note that from the properties of logarithms,

$\log_a20 = \log_a(5×4)$

$\:\:\:\:\:\:\:\:\:\:= \log_a(5×2^2)$

$\:\:\:\:\:\:\:\:\:\:=\log_a5 + \log_a(2)^2$

$\:\:\:\:\:\:\:\:\:\:=\log_a5 + 2\log_a2$

$\:\:\:\:\:\:\:\:\:\:\approx 0.699 + 2(0.301)$

$\:\:\:\:\:\:\:\:\:\:= 1.301$

6 0

2 years ago

Suppose a simple random sample of size nequals45 is obtained from a population with muequals64 and sigmaequals14. (a) What must

jeka94

Answer:

Step-by-step explanation:

Given that sample size = n=45

mu = 64 and sigma =14

a) Sample mean will follow a normal distribution irrespective of the original distributions provided

i) samples are randomly drawn

ii) samples represent the population

iii) Sample size is sufficiently large

b) Here we have sample std dev= $\frac{\sigma}{\sqrt{n} } \\=\frac{14}{\sqrt{45} } \\=2.09$

$P(X bar>68.1) = P(Z>\frac{68.1-64}{2.09} \\=P(Z>1.96)\\=0.25$

c) $P(X bar>66.3) = P(Z>\frac{66.3-64}{2.09} \\=P(Z>1.10)\\=0.136$

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2 years ago

Tell multiple ways to write 65% as a fraction

xxMikexx [17]

65/100 or 13/20
Both work, it's just that 13/20 is simplified

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3 years ago

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Find sin(90°). 45° A.0 В.1 C. square 2 D. square 2 / 2

otez555 [7]

Answer:

sin90° = 1.

Step-by-step explanation:

Using the diagram, we notice that the side opposite of the 90° angle is the hypotenuse itself.

Therefore sin90° = Hypotenuse/Hypotenuse = 1.

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3 years ago