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Anna007 [38]
3 years ago
14

Roberto is x years older than his only sister but 10 years ago he was twice her age. What are the current ages of the siblings?

Mathematics
1 answer:
adell [148]3 years ago
6 0

Answer:

S = x + 10

R = 2x + 10

Step-by-step explanation:

If R is Roberto's age, and S is his sister's age, then:

R = S + x

R − 10 = 2 (S − 10)

Solve with substitution.

S + x − 10 = 2 (S − 10)

S + x − 10 = 2S − 20

S = x + 10

R = 2x + 10

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the variables y and x have a proportinal relationship and y=12 when x=5 . what is the value of y when x=8?
Law Incorporation [45]

Answer:

y = \frac{96}{5}

Step-by-step explanation:

given that y and x are proportional then the equation relating them is

y = kx ← k is the constant of proportionality

to find k use the given condition y = 12 when x = 5

k = \frac{y}{x} = \frac{12}{5}

y = \frac{12}{5} x ← equation of proportionality

when x = 8, then

y = \frac{12}{5} × 8 = \frac{96}{5}


7 0
3 years ago
If Elena sells 15 adult tickets, does she sell at least 100 total tickets ? Justify your work
Semenov [28]

Answer: baby 5

Step-by-step explanation:

I dont know 5+5 = baby 5

3 0
3 years ago
What is an equation in point-slope form of the line shown below? (-2,1) (4,4)
Natali [406]

Answer:

y = 1/2x +2

Step-by-step explanation:

y-y1= m (x-x1)

first find slope

m= 4-1 / 4 - (-2)

m= 3 / 4+2

m= 3/ 6

m = 1/2

you can pick any of the two points to solve for point slope form

y-4 = 1/2 (x-4)

y-4= 1/2x -2

add 4 on both sides

y = 1/2x +2

y-1= 1/2 (x- (-2))

y-1= 1/2 (x+2)

y-1= 1/2x +1

add 1 on both sides

y= 1/2x +2

you should get the same answer with any of the two points you chose

you might want to use a calculator to solve this

if you want to use both points to make sure the answer is correct, you can

if you don't get the same answer with both points then u did something wrong during the equation.

4 0
3 years ago
Help me please! don’t right nonsense! i have 15 minutes left!
Crazy boy [7]

Answer:

let M(-3,-4) be (x1, Y1)

    T(5,0) be (x2,y2)

m:n = 2 : 3

using section formula

Q(x,y) =  {mx2 + nx1/(m+n), my2 + ny1/(m+n)}

        { ( 10 -9)/5, (0 -12)/5}

         (1/5, -12/5)

This could be answer if internally

3 0
3 years ago
If bowling costs $15 and shoe rentals 4$ and o spent 35$ how many games did I play
Rudiy27

Well if we add 15 + 15 + 4, we get 34, which, when we include tax, is about $35. So you played 2 games. Hope that helps!

8 0
4 years ago
Read 2 more answers
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