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kupik [55]
3 years ago
13

The price of an item has been reduced by 45%. The original price was $31.

Mathematics
1 answer:
Andreas93 [3]3 years ago
7 0

Answer:

56.4

Step-by-step explanation:

If the initial price is reduced by 45% means it is the 55% of the initial price (45+55=100)

0.55x = 31 \\ x =  \frac{31}{0.55}  = 56.36

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Use slope-intercept form, y = mx + b to find the equation of the line that passes through the points (−6, 1) and (3, 4).
Nitella [24]

Answer:

<h3>Y=1/3x+3</h3>

Step-by-step explanation:

To solve this problem, first, you have to use the slope formula of y₂-y₁/x₂-x₁=rise/run. Remember to solve this problem, use slope-intercept form of y=mx+b.

m represents the slope.

b represents the y-intercept.

Y₂=4

Y₁=1

X₂=3

X₁=(-6)

Solve & simplify.

\displaystyle \mathsf{\frac{4-1}{3-(-6)}=\frac{3}{9}=\frac{3\div3}{9\div3}=\frac{1}{3}    }}

The slope is 1/3.

Y-intercept is 3.

y=1/3x+3

In conclusion, the correct answer is y=1/3x+3.

4 0
3 years ago
What is the product of 5−2i and 3−4i?<br> Enter your answer, in standard form, in the box
Lelechka [254]

Answer:

\boxed{7-26i}

Step-by-step explanation:

The binomials are multiplied in the usual way, using FOIL or the distributive property:

  (5 -2i)(3 -4i) = 15 -20i -6i +8i²

Since i² = -1, this becomes ...

  = 15 -20i -6i -8 = 7 -26i

7 0
3 years ago
The equation for a parabola has the form y = ax^2 + bz + c, where a, b, and c are constants and aメ0. Find an equation for the pa
vova2212 [387]

Answer:

a = 2, b = -9, c = 3

Step-by-step explanation:

Replacing x, y values of the points in the equation y = a*x^2 + b*x +c give the following:  

(-1,14)

14 = a*(-1)^2 + b*(-1) + c  

(2,-7)

-7 = a*2^2 + b*2 + c  

(5, 8)  

8 = a*5^2 + b*5 + c  

Rearranging:

a - b + c = 14  

4*a + 2*b + c = -7

25*a + 5*b + c = 8

This is a linear system of equations with 3 equations and 3 unknows. In matrix notation the system is A*x = b whith:

A =

1    -1  1

4    2  1

25  5  1

x =

a  

b

c

b =

14

-7

8

Solving A*x = b gives x = Inv(A)*b, where Inv(A) is the inverse matrix of A. From calculation software (I used Excel) you get:

inv(A) =  

0.055555556 -0.111111111   0.055555556

-0.388888889 0.444444444   -0.055555556

0.555555556 0.555555556 -0.111111111

inv(A)*b

2

-9

3

So, a = 2, b = -9, c = 3

5 0
3 years ago
Which expression equals 93102
Karo-lina-s [1.5K]

Answer:

you got this

Step-by-step explanation:

goodluck

4 0
2 years ago
Please help! / 50 points
lutik1710 [3]

Answer:

Solution given:

radius [r]=4

height [h]=5

we have

Surface area of cylinder=2πr(r+h)

=2π×4(4+5)

=<u>72πunits³ is a required volume.</u>

3 0
3 years ago
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