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Nutka1998 [239]
3 years ago
5

What property should be used to solve this one-step equation : a-3=7

Mathematics
1 answer:
Aleks04 [339]3 years ago
6 0

Answer:

D

Step-by-step explanation:

a - 3 = 7 ( add 3 to both sides )

a - 3 + 3 = 7 + 3 , that is

a = 10

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Is the line through points P(2, –5) and Q(–5, –1) parallel to the line through points R(5, 4) and S(–2, 5)? Explain.
Irina-Kira [14]

Answer:

the answer is No

Step-by-step explanation:

Since the first line has a slope of -4/7 and the other line has a slope of -1/7. This can be shown in point slope form y-y1=m(x-x1) where m=∆y/∆x.

Through points P and Q, the point slope is represented as -1-(-5)=m(-5-2) ; 4 = -7m ; m = 4/-7. The next two points R and S can be shown in point slope as 5-4=m(-2-5) ; 1 = -7m ; m =1/-7. With the fact that parallel lines must have equal slopes, these two lines cannot be parallel because -4/7≠-1/7

3 0
3 years ago
Assume your faucet drips at the rate of 3 drops per minute. Further assume that 20 drops is equal to 1 ml. How many drops will i
77julia77 [94]
3 drops per minute
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How many milliliters?
4320/20 = 216 ml
5 0
3 years ago
Help me please, <br><br>Calculate the external perimeter of the picture frame: <br>​
Studentka2010 [4]
Perimeter of a parallelogram = 2(l+b)
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Which statement correctly describes the diagram?
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Step-by-step explanation:

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A container holds a combination of nickels and quarters. There are 156 coins in all, and their total value is $21.60. The system
Tatiana [17]
X+y=156
<span>0.05x+0.25y=21.6

-1/4*/ x+y=156
1/20x+1/4y=216/10

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</span>1/20x+1/4y=216/10
<span>+--------------------------
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<span>
87+y=156    y=69

this question answer is </span><span>87 nickels and 69 quarters</span><span>

</span>
3 0
3 years ago
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