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MrRissso [65]
2 years ago
10

12. Nine more than y is twenty one.​

Mathematics
2 answers:
Pavel [41]2 years ago
6 0

Answer

y=12

Step-by-step explanation:

y+9=21   (this would be the formula)

 -9   -9   (you want to eliminate 9 from the equation, so subtract it from both sides of the equation)

y=12        (after subtracting 9 from both sides you are left with 12)

<em>Check it</em>

12+9=21  (is this true?)

21=21 (yes it is true, therefore y=12)

Anettt [7]2 years ago
4 0

Answer:

y+9=21

Step-by-step explanation:

9 more than y equals 21.

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2− ​0.5n=3n+16<br><br> Help
Mariulka [41]
2 - 0.5n= 3n+16
-----------------------            subtract 2 from both sides
-2                   -2

-0.5n = 3n+14
-----------------------             then subtract -3n from both sides as well
-3n       -3n

-3.5n = 14
---------------                       divide -3.5 on each side
-3.5       -3.5
                                        simplify
Answer: n= -4
8 0
3 years ago
Given $m\geq 2$, denote by $b^{-1}$ the inverse of $b\pmod{m}$. That is, $b^{-1}$ is the residue for which $bb^{-1}\equiv 1\pmod
goblinko [34]

(2+3)^{-1}\equiv5^{-1}\pmod7 is the number <em>L</em> such that

5L\equiv1\pmod7

Consider the first 7 multiples of 5:

5, 10, 15, 20, 25, 30, 35

Taken mod 7, these are equivalent to

5, 3, 1, 6, 4, 2, 0

This tells us that 3 is the inverse of 5 mod 7, so <em>L</em> = 3.

Similarly, compute the inverses modulo 7 of 2 and 3:

2a\equiv1\pmod7\implies a\equiv4\pmod7

since 2*4 = 8, whose residue is 1 mod 7;

3b\equiv1\pmod7\implies b\equiv5\pmod7

which we got for free by finding the inverse of 5 earlier. So

2^{-1}+3^{-1}\equiv4+5\equiv9\equiv2\pmod7

and so <em>R</em> = 2.

Then <em>L</em> - <em>R</em> = 1.

6 0
3 years ago
The weight of an object on mars varies directly is proportional as the weight of the object on earth a 75 pound object on earth
dedylja [7]

Answer:

It weighs 40 pounds on mars

Step-by-step explanation:

Direct proportion is the relationship between two variables when their ratio is equal to a constant value

  • It can be expressed as y = k x, where y varies directly as x and k is constant of variation
  • It can be expressed as  \frac{y_{1}}{x_{1}}=\frac{y_{2}}{x_{2}}=k

∵ The weight of an object on mars varies directly as the weight

    of the object on earth

∴ w(m) = k × w(e)

∵ The weight of the object on earth is 75 pound

∴ w(e) = 75

∵ The weight of this object on mars is 25 pounds

∴ w(m) = 25

- Substitute them in the equation of variation

∵ 25 = k × 75

- Divide both sides by 75

∴ \frac{1}{3} = k

∴ w(m) = \frac{1}{3} × w(e)

∵ An object weighs 120 pounds on earth

∴ w(e) = 120

- Substitute it in the equation of variation

∴ w(m) = \frac{1}{3} × 120

∴ w(m) = 40

∴ It weighs 40 pounds on mars

5 0
2 years ago
Could someone help me asap? :)
svetoff [14.1K]

Answer:

1. The top choice.

2. The third choice.

3. The third choice.

Step-by-step explanation:

Number one is a line, so it should have two arrows.

Number 2 is a segment, so it should have no arrows.

Number 3 is a ray, so it should have one arrow. (The letters need to be in the same direction as the ray, hence why it is BC and not CB)

5 0
3 years ago
Read 2 more answers
-3/4= 3a/7. What is it? I have no idea how to solve this.
Vsevolod [243]

Answer:

\boxed{ \bold{ \huge{ \boxed{ \sf{a =  - 1.75}}}}}

Step-by-step explanation:

\sf{ \frac{ - 3}{4}  =  \frac{3a}{7} }

Do cross multiplication

\dashrightarrow{ \sf{3a \times 4 = 7 \times ( - 3)}}

\longrightarrow{ \sf{12a =  - 21}}

Divide both sides by 12

\longrightarrow{ \sf{ \frac{12a}{12}  =  \frac{ - 21}{12}}}

Calculate

\longrightarrow{ \sf{a =  - 1.75}}

Hope I helped!

Best regards! :D

7 0
2 years ago
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