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kogti [31]
3 years ago
11

Matilda needs at least $112 to buy a new dress. She has already saved $40. She earns $9 an hour babysitting. Write and solve an

inequality to find how many hours she will need to babysit to buy the dress. Interpret the solution.
Mathematics
2 answers:
nikitadnepr [17]3 years ago
7 0
This is how many hours you will need 5 hours
Dennis_Churaev [7]3 years ago
4 0

she will need two more hours to buy the dress

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Number 15. Find the equation of the line that passes through (3,-1) and is perpendicular to the line that passes through (-5, 2)
MArishka [77]
For lines to be perpendicular their slopes must be negative reciprocals of one another, mathematically:

m1*m2=-1

So we first need to find the slope of the reference line.

m=(y2-y1)/(x2-x1)=(7-2)/(-1--5)=5/4

So the perpendicular line will have a slope of:

5m/4=-1

m=-4/5

So our perpendicular line so far is:

y=-4x/5+b, now we can use point (3,-1) to solve for the y-intercept, "b"

-1=-4(3)/5+b

-1=-12/5+b

-5/5+12/5=b

7/5=b

So the line is:

y=-4x/5+7/5 or more neatly

y=(-4x+7)/5

y=-0.8x+1.4
3 0
3 years ago
Solve for x given the point (x,9) is a point on the line y = 3x + 7.
Ket [755]

Answer:

0.67 = x

Step-by-step explanation:

to solve the value of x we need to : (x,9)

y = 3x + 7

9 = 3x + 7

9 - 7 = 3x

2 = 3x

2/3 = x

0.67 = x

5 0
3 years ago
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Question 6. Which expression is equivalent to this expression? x(2x + 3)
suter [353]

Answer:

The answer is D

You have to distribute the x to the 2x + 3 equation

This will result in 2x^2 + 3x

5 0
3 years ago
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23 yd
stealth61 [152]
72.22 I think I’m sorry if I’m wrong
4 0
3 years ago
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Find the equation of the line:
natta225 [31]

Answer:

x=4.5.

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x = 4.5

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1 year ago
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