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meriva
3 years ago
8

Sales tax is 6%. Bought car for$820 what was cost of car

Mathematics
2 answers:
pogonyaev3 years ago
8 0
820 + .06(820)
820 + 49.2
869.2
The cost of the car is $869.20.
ElenaW [278]3 years ago
5 0
820 * 6%=49.20
820 + 49.20= 869.20
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Determine the equation of the line that passes through the points of intersection of the graphs of the quadratic functions f(x)
timofeeve [1]

Answer:x-2y-2=0

Step-by-step explanation:

Given :

f(x) = x^2 - 4 \\ g(x) = - 3x^2 + 2x + 8

Point of intersection :

f(x)=g(x)\\x^2-4=-3x^2+2x+8\\4x^2-2x-12=0\\2x^2-x-6=0\\2x^2-4x+3x-6=0\\2x(x-2)+3(x-2)=0\\(x-2)(2x+3)=0\\x=2\,,\,\frac{-3}{2}

x=2\,;f(2)=2^2-4=0\\x=\frac{-3}{2}\,; f\left ( \frac{3}{2} \right )=\left ( \frac{3}{2} \right )^2-4=\frac{-7}{4}=-1.75

So, we have points \left ( 2,0 \right )\,,\,\left ( -1.5,-1.75\ \right )

Equation of line passing through two points \left ( x_1,y_1 \right )\,,\,\left ( x_2,y_2 \right ) is given by y-y_1=\frac{y_2-y_1}{x_2-x_1}\left ( x-x_1 \right )

Let \left ( x_1,y_1 \right )=\left ( 2,0 \right )\,,\,\left ( x_2,y_2 \right )=\left ( -1.5,-1.75\ \right )

So, equation is as follows :

y-0=\frac{-1.75-0}{-1.5-2}\left ( x-2 \right )\\y=\frac{-1.75}{-3.5}\left ( x-2 \right )\\y=\frac{1}{2}(x-2)\\2y=x-2\\x-2y-2=0

4 0
3 years ago
Please help i need answer and explanation.
allsm [11]

Answer:

m<TVZ = 95

Step-by-step explanation:

2x+15+2x+5= 180

4x+20 =180

     -20  -20

4x=160

x= 40

2x+15= m<TVZ

2(40)+15 = m<TVZ

80+15 = m<TVZ

95 = m<TVZ

To check:

2x+5= <WVZ

2(40)+5 = <WVZ

80+5 = <WZV

85+95 = 180

The two angles together should equal 180. Comment if you have any questions :)

6 0
3 years ago
Read 2 more answers
Help me thank you <br> .......
katrin2010 [14]

Answer:

$2.71

Step-by-step explanation:

$2 dollars in ones + $0.50 in quarters + $0.20 in dimes + $0.01 in pennies equals out to $2.71

8 0
3 years ago
What is the slope between point A (-9, 4) and B ( 3, -2)
MaRussiya [10]

Slope can be calculated using the formula: m=   \frac{y2 -y1}{x2-x1}

y1/x1 represents the first number in the bracket

y2/x2 represents the second number in the bracket

Calculation

m =  \frac{y2 -y1}{x2-x1}

m =  \frac{4 - (-2)}{(-9)-3}

m= 6/-12

m= -0.5 or -1/2

Therefore, the answer is B.

5 0
3 years ago
A, B, C and D lie on the circumierence of the circle.
REY [17]

Answer:

Step-by-step explanation:goofy

3 0
3 years ago
Read 2 more answers
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