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den301095 [7]
3 years ago
11

Simplify the expression below: 5 (3z – 7z + 4)

Mathematics
2 answers:
Alla [95]3 years ago
7 0
15z -35z +20 is the answer
sweet-ann [11.9K]3 years ago
4 0
<span>5 (3z – 7z + 4)=</span>-20z+20
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Each piece of candy weighs one eight pound. If Donna buys 15 pieces of candy how many pounds of candy will she buy.
likoan [24]

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3 years ago
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George bought 30 packs of football cards.There were 14 cards in each pack.How many cards did George buy
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6 0
3 years ago
Write the equation of a line passing through (6,-2) and perpendicular to -2x + 3y= -6
____ [38]
Perpendicular lines refers to a pair of straight lines that intercept each other. The slopes of this lines are opposite reciprocal, meaning that it's multiplication is -1.
On this case they give you the equation of a line and a point, and is asked to find the equation of a line that is perpendicular to the given one, and that passes through this point.


-2x+3y=-6                 Add 2x in both sides
3y=2x-6                    Divide by 3 in both sides to isolate y
y=2/3x-6/3


The slope of the given line is 2/3, which means that the slope of a line perpendicular to this one, needs to be -3/2. Now you need to find the value of b or the y-intercept by substituting the given point into the formula y=mx+b, where letter m represents the slope.

y=mx+b                 Substitute the given point and the previous slope found
-2=(-3/2)(6)+b       Combine like terms
-2=-9+b                 Add 9 in both sides to isolate b
7=b

The equation that represents the line perpendicular to -2x+3y=-6 and that passes through the point (6,-2), is y=-3/2x+7.


4 0
3 years ago
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