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Scorpion4ik [409]
3 years ago
10

Which expressions are equivalent to -90 - 60w? Choose three. *Hint: On each answer choice below, use the distributive property t

o decide which ones match -90-60w. Also remember that -60w-90 is equivalent to -90-60w a) -30(3 + 2w) b) (-9 − 6w) x 10 c) -3(30 - 20w) d) (6 + 4w) × 15 e) −20(4.5 + 3w)
Mathematics
1 answer:
marusya05 [52]3 years ago
5 0

Answer:

a), b), e)

Step-by-step explanation:

<em>a) -30(3 + 2w) = -90 - 60w</em>

<em>b) (-9 − 6w) x 10 = -90 - 60w</em>

c) -3(30 - 20w) = -90 + 60w

d) (6 + 4w) × 15 = 90 + 60w

<em>e) −20(4.5 + 3w) = -90 - 60w</em>

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5x+2y-(-3x+2y)=-4-12
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insert x=-2 into I:
5*(-2)+2y=-4
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y=3

(-2,3)

question 6)
I: totalcost=115=3*childs+5*adults
II: 33=adults+childs
33-adults=childs

insert childs into I:
115=3*(33-adults)+5*adults
115=99-3*adults+5*adults
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insert adults into II:
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so it's the last option

question 7)
a) y<6 and y>2 can also be written as 2<y<6, so solution 3 exist for example
b) y>6 and y>2 can also be written as 2<6<y, so solution 7 exist for example
c) y<6 and y<2 inverse of b: y<2<6, so for example 1
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so it's the last option

question 8)
I: x+y=12
II: x-y=6

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insert y into I:
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(9,3)

question 9)
I: x+y=6
II: x=y+5

if you take the x=y+5 definition of II and substitute it into I:
(y+5)+y=6

which is the second option :)
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