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ikadub [295]
2 years ago
14

Find the area of a circle whose diameter is 7cm​

Mathematics
2 answers:
dimulka [17.4K]2 years ago
7 0

Answer:

38.5 cm^2

Step-by-step explanation:

Diameter ( d ) = 7 cm

Radius ( r ) = 7 / 2 cm

Formula : -

Ar ( circle ) = π r^2

π r^2

= ( 22 / 7 ) x ( 7 / 2 )^2

= ( 22 / 7 ) x ( 49 / 4 )

= 38.5 cm^2

vodka [1.7K]2 years ago
4 0

Answer:

3.5pi

Step-by-step explanation:

just multiply together and you'll get your answer

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What is the amount sales tax on a suit priced at $3,129 if the sales tax rate is 4%?
svp [43]
To find the tax = $3129 × 4% = $125.16.
The final price = $3129 + $125.16 = $3254.16.

Hope this helps
8 0
3 years ago
A 1313​-foot piece of string is cut into two pieces so that the longer piece is 44 feetfeet longer than twice the shorter piece.
Kitty [74]

Answer:

423

Step-by-step explanation:

Start by setting up a formula.

x = the shorter piece

total = 1313

longer piece = (x*2) + 44

x + (x*2) + 44 = 1313

Simplify

3x + 44 = 1313

Now we must solve for x.

Whatever you do on the left side of the equal sign must also be done on the right.

The goal is to get x by itself on the left side.

Do the easiest thing first, which is usually addition or subtraction. In this case, subtract 44 from both sides.

3x + 44 - 44 = 1313 - 44

3x = 1269

Now the only way to cancel out the 3 on the left is to divide by 3. Since 3/3 =1. Remember this must be done on both sides to keep things equal.

3x/3 = 1269/3

x=423

The End

8 0
3 years ago
22 POINTS, NEED URGENT HELP
rjkz [21]
1) start with (x-h)^2 + (y-k)^2 = r^2.  Insert the given info:  center at (-1,8) and radius 5:

              (x+1)^2 + (y-8)^2 = 5^2     (answer)
7 0
2 years ago
What is the value of w?
Dima020 [189]
You do 65+90=155
then 180-155=25 to get the angle next to w
w=155
7 0
3 years ago
A backpack that normally sells for $39 Is on sale for 33% off. Find the amount of the discount and the sale price
Nataliya [291]
To get the price, you have to multiply the amount by the percent it would become.

100% of 39 is 39
It is 33% off
100 (1.00) - 33 (0.33) = 67% (0.67)

Remember, the percent is a decimal because it is part of a whole (1).

39*0.67=$26.13.

5 0
3 years ago
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