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3 years ago

Last week Betsy made 80 on her quiz.

Mathematics

1 answer:

My name is Ann [436]3 years ago

8 0

The answer is 4% because 80%-76%=4%

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I'm really not sure how to go about solving this algebraic equation, please help! .513 = (2x)^2 / (.05-x)

LiRa [457]

Let's set it up like this:
$0.513=\frac{\left(2x\right)^2}{\left(0.05-x\right)}$
Multiply both sides by $0.05-x$
$0.513\left(0.05-x\right)=\frac{\left(2x\right)^2}{0.05-x}\left(0.05-x\right)$
$0.513\left(0.05-x\right)=4x^2$
We are then going to use the distributive property. Since we also know that the opposite of an number that is squared is the square root, we can also apply that. We would be left with something like this:
$x=-\frac{0.513+\sqrt{0.673569}}{8},\:x=\frac{\sqrt{0.673569}-0.513}{8}$
The variable $x$ can be both positive or negative.
We have found successfully our answer.

Let me know if you have any questions regarding this problem!
Thanks!
-TetraFish<span />

4 0

3 years ago

Can someone quickly help me solve this ?!

Rainbow [258]

Answer: 8

Step-by-step explanation: if you count the angels and the sides then you'll get the answer 8..

7 0

3 years ago

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What is the area of the trapezoid?

ratelena [41]

Answer:

29.5 inches squared

Step-by-step explanation:

The formula for the area of a trapezoid is $\frac{base1 + base2 * height}{2}$ ,

so base1 = 14 inches and base2 = 30 inches

since there is a right angle, you know that the height must equal the length of the left side, so the height = 15 inches

then, 14+30+15=59 and 59/2=29.5

therefore, your answer would be 29.5 inches squared

7 0

3 years ago

A rectangular wall has length 3 less than 4 times the width . I wish to put a silver line along the corners of the wall. The lin

Thepotemich [5.8K]

Answer:

Step-by-step explanation:

Let width = w units

Length = 4w - 3

Cost for lining corners of wall = $ 18.50

Perimeter of the wall = 18.50/0.25 = 74 ft

2*(length +width ) = 74

2*(4w - 3 + w) =74

2*(5w - 3) =74

10w - 6 = 74 {Add 6 to both sides}

10w - 6 + 6 = 74 + 6

10w = 80

Divide both sides by 10

10w/10 = 80/10

w = 8 ft

Length = 4w - 3 = 4*8 - 3 = 32 - 3

Length = 29 ft

Area of the wall = length * width

= 29 * 8

= 232 square ft

Cost of painting the wall per square feet = 20 cents = 0.20

Cost of painting 232 square feet = 232 * 0.20

= $ 46.40

4 0

3 years ago

Which equation represents a hyperbola shown in the graph?

Paladinen [302]

Answer:

It's C

Step-by-step explanation:

6 0

3 years ago

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