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Komok [63]
3 years ago
8

After spending $28 on a laser disc, the man finds that he just spent 4/7 of his money. How much did he have originally?

Mathematics
2 answers:
masha68 [24]3 years ago
6 0
Answer=49$
Because you have to devid 28 by 4 and then multiply that by7
Rainbow [258]3 years ago
4 0
X=amount of money at first.

we can suggest this equation:
4/7 x=28

x=(28*7)/4
x=196/4
x=49

Answer: he have originally $49. 
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=52.5cm^2

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Which of the following is a true statement?
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3 years ago
A piece of wire is 76cm long. It is cut into two unequal parts and each part is bent into a square. The sum of the areas of the
NemiM [27]

Answer:

The length of the shorter part of the wire is 24 centimeters.

Step-by-step explanation:

Let L the total length of the piece of wire, where L-x and x are the perimeters of the greater and lesser squares. All lengths are measured in centimeters. Since squares have four sides of equal length, the side lengths for the greater and lesser squares are \frac{L-x}{4} and \frac{x}{4}. From statement we find that the sum of the areas of the two squares (A), measured in square centimeters, is represented by the following expression:

A = \left(\frac{L-x}{4} \right)^{2}+\left(\frac{x}{4} \right)^{2} (1)

And we expand this polynomial below:

A = \frac{L^{2}-2\cdot L\cdot x +x^{2}}{16} + \frac{x^{2}}{16}

A = \frac{L^{2}-2\cdot L\cdot x +2\cdot x^{2}}{16}

2\cdot x^{2}-2\cdot L\cdot x +L^{2}-16\cdot A = 0 (2)

If we know that L = 76\,cm and A = 205\,cm^{2 }, then the length of the shorter part of the wire is:

2\cdot x^{2}-152\cdot x +2496 = 0

By the Quadratic Formula, we determine the roots associated with the polynomial:

x_{1} = 52\,cm, x_{2} = 24\,cm

The length of the shorter part of the wire corresponds to the second root. Hence, the length of the shorter part of the wire is 24 centimeters.

3 0
3 years ago
At a cost restaurant the cost for a hot dog and a soft drink is $2.10. The cost for two hot dogs and three soft drinks is $5.15.
Alja [10]

Answer:

The cost of soft drink is $0.95

Step-by-step explanation:

Let the cost of hot dog be x

Cost of 2 hot dogs = 2x

Let the cost of soft drink be y

Cost of 3 soft drinks = 3y

At a cost restaurant the cost for a hot dog and a soft drink is $2.10.

So, x+y=2.10

The cost for two hot dogs and three soft drinks is $5.15

So, 2x+3y=5.15

Plot the lines on the graph:

x+y=2.10 --Purple line

2x+3y=5.15 --- Black Line

Intersection point =(x,y)=(1.15,0.95)

Hence The cost of soft drink is $0.95

7 0
3 years ago
You decide to take your mom to a restaurant for her birthday lunch. Your bill came to $26.53. You need to leave a tip for your w
Alborosie

Answer:

$31.30 is the total bill

Step-by-step explanation:

if you multiply 26.53 by 18% you get 4.77. then when you add the 26.53 by 4.77 you would get $31.30. Your welcome (pls give brainliest)

3 0
3 years ago
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