3 years ago

Evaluate the expression 8-3×2+5

Mathematics

1 answer:

siniylev [52]3 years ago

5 0

Answer:

Step-by-step explanation:

First do 3x2 to get 6, and then do 8-6, which is 2, and add that to 5 to get 7

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Segment RS has endpoints at R(5,-3) and S(5,13) , Point Q lies on RS such that RQ : QS = 3 : 1 . Which of the following must be

Liula [17]

Answer:

(3) Q(5,9)

Step-by-step explanation:

Let point Q has coordinates (x,y). Consider vectors $\overrightarrow{RQ}$ and $\overrightarrow{QS}.$ Note that

$\overrightarrow{RQ}=(x-5,y+3);$
$\overrightarrow{QS}=(5-x,13-y).$

Since $\dfrac{RQ}{QS}=\dfrac{3}{1},$ then

$\dfrac{\overrightarrow{RQ}}{\overrightarrow{QS}}=\dfrac{3}{1},$

Thus,

$\dfrac{x-5}{5-x}=\dfrac{3}{1}\Rightarrow x-5=3(5-x),\ x-5=15-3x,\ 4x=20,\ x=5.\\ \\\dfrac{y+3}{13-y}=\dfrac{3}{1}\Rightarrow y+3=3(13-y),\ y+3=39-3y,\ 4y=36,\ y=9.$

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Step-by-step explanation:

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3 years ago

If Jim Roller can paint a room in 3 hours while John Brush would take 5 hours, how long will they take if they work together?

andrew11 [14]

Answer:

4 hrs

Step-by-step explanation:

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This is basically finding the average of two numbers, and you can use multiple different equations to find the same answer.

3/2 + 5/2 =4

(3+5)/2 =4

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