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igor_vitrenko [27]
3 years ago
13

Melanie buys a carrying case for her new laptop computer. The retail price is $24.50 and the sales tax is 7%. What is the amount

of the sales tax?
Mathematics
1 answer:
kvv77 [185]3 years ago
7 0
1. 7% can also be written as .07
2. To figure out what 7% of 24.50 is than you need to multiple 24.50*.07.
3. 24.50*.07 = 1.715 or $1.72
4. Another way to think about this is as follows:
X/24.50= 7/100 and solve for X
24.50*7 =100x
171.50 =100x
171.50/100=x
1.715 =X
24.50*.07= 1.715 or $1.72
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Sally and her husband Jim left their house at the same time traveling in the same direction. Sally drove at 55mph and Jim drove
romanna [79]

Answer:

It will take 10 hours.

Step-by-step explanation:

We know distance = rate * time

Sally's rate = 55

Jim's rate = 65

We want Jim to be 100 miles ahead of Sally

The time will always be the same.

d =Sally's distance


Sally

d = 55t


Jim

d+100 = 65 t


We know have 2 equations with 2 unknowns.  Substitute d= 55t into Jim's equations

55t + 100 = 65t

Subtract 55t from both sides.

55t-55t + 100 = 65t-55t

100 = 10t

divide each side by 10

100/10 = 10t/10

10 = t


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3 years ago
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2 years ago
The Area of a square at right is 72 square units Find the value of X, <br>Did I do this right?
Assoli18 [71]
Yes, your work is correct.

The diagram does illustrate x²+6x+9=72.  This is also represented by

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We can take the square root of both sides:
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2 years ago
What is the volume of a sphere with a radius of 7 cm? Sphere V = 4 3 πr3 1. Substitute the radius into the formula:    V = 4 3 π
netineya [11]

Answer:

1436.75504 or 1372/3π cm^3

Step-by-step explanation:

The volume of a sphere can be found using:

V = 4/3 πr^3

We know the radius is 7, so we can substitute 7 in for r

V = 4/3 π7^3

Evaluate the exponent

V = 4/3 π 343

If we want the answer in terms of pi, multiply the two other numbers, that are not pi: 4/3 and 343.

v= (4/3*343)π

v=1372/3π

If we want an exact answer, multiply 1372/3 and pi

v=1436.75504

So, the volume is 1436.75504 or 1372/3 π cm^3

4 0
3 years ago
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mariarad [96]

Answer:

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Step-by-step explanation:

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