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2 years ago

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)

Check it

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 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 L 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 L = 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 R = 2.

Then L - R = 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 $\frac{y_{1}}{x_{1}}=\frac{y_{2}}{x_{2}}=k$