Can you guy's please help me out I was absent and now I don't have a clue!

Mathematics

1 answer:

Elena-2011 [213]3 years ago

6 0

For these problems you have to use PEMDAS so for problem 15 you would do the parentheses first, (21-3) you get 18 and then exponents, 3^2, you get 9, no multiplication but there is division so take your answers, 18 and 9 and divide them, you get 2, so the answer to 15 is 2.

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Answer:

Step-by-step explanation:

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3 years ago

Lisa is now six years older than Cheryl. In two years, Lisa will be twice as old as Cheryl. How old is Lisa now?

Elena-2011 [213]

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Define x :
--------------------------------------------------
Let Cheryl be x years old.
Cheryl = x
Lisa = x + 6

--------------------------------------------------
In two years time:
--------------------------------------------------
Cheryl = x + 2
Lisa = x + 8

--------------------------------------------------
Lisa will be twice as old as Cheryl :
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x + 8 = 2(x + 2)

--------------------------------------------------
Solve x :
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x + 8 = 2(x + 2)
x + 8 = 2x + 4
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Find their age :
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Cheryl = x = 4
Lisa = x + 6 = 4 + 6 = 10

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Answer: Lisa is 10 years old now.
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Step-by-step explanation:

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2 years ago

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$\sf 5x+2y=21$
$\sf -2x+6y=-34$

We could solve for 'x' in the 2nd equation and then plug that into the first equation for 'x' and solve for 'y':

$\sf -2x+6y=-34$

Subtract 6y to both sides:

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Divide 17 to both sides:

$\boxed{\sf y\approx -3.8}$

This is the y-coordinate of the solution.

5 0

3 years ago

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