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Llana [10]
3 years ago
14

HELP PLEAAESEEEEEEeee

Mathematics
1 answer:
Artyom0805 [142]3 years ago
5 0
The answer should be option D.
Because natural number can be negative .
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Holly made 12 pair of earrings for each of her girlfriends. To wrap the pairs individually, she creates a simple cardboard gift
Mekhanik [1.2K]

Answer:

3280cm²

Step-by-step explanation:

We are told the gift box is folded into a Pyramid with a square base.

Hence, we are to find the Surface Area of a square pyramid

From the question, we are given:

Length of the base of the square = 10cm

Triangle

Side length = 10cm

Height = 8 2/3 cm

A square Pyramid has 5 faces: 4 triangles and 1 square.

Step 1

Find the Area of the square

Formula = Side length² this is because all the side of a square is equal.

Length of the base = 10cm

Area of the square = (10cm)²

= 100cm²

Step 2

Find the Area of the triangle. We are told the 4 triangles are equilateral, which means their side are equal.

Hence, for one triangle.

Area of a triangle = 1/2 × base × height

Base = side length = 10cm

Height = 8 2/3 = 8.6666666667cm

Area of a triangle = 1/2 × 10 × 8.6666666667

Area of a triangle = 43.333333333cm²

Since we have 4 triangles

We would have : 4 × 43.333333333cm²

= 173.33333333cm²

The Area of the 4 equilateral triangles =

173.33333333cm²

Step 3

The Surface area of the Square Pyramid

= Sum of the areas of all the faces.

= 100cm² + 173.33333333cm²

= 273.33333333cm²

Therefore, the minimum amount of cardboard needed to make one gift box = 273.33333333cm²

Step 4

The minimum amount of cardboard Holly needs to create 12 gift boxes to wrap each pair of earrings individually is calculated as: 12 × 273.33333333cm²

= 3280cm²

7 0
3 years ago
A test has 19 questions worth a total 100 points. There are ten-point questions and four-point questions. How many questions of
kramer
X + y = 19

10x + 4y = 100

This is a systems of equations. 

Isolate x from the first equation:
x = 19 - y

Now, plug it into the second:

10(19 - y) + 4y = 100
190 - 10y + 4y = 100
-6y + 190 = 100
-6y = -90
y = 15

Plug y in and solve for x:
10x + 4(15) = 100
10x + 60 = 100
10x = 40
x = 4

There are four 10-point questions and fifteen 4-point questions.
3 0
3 years ago
Read 2 more answers
Jen earns $8 per hour. He gets a raise of 3.5%. How much is his raise?
Yuliya22 [10]

Answer:

His raise is $.28 per hour

Step-by-step explanation:

To calculate his raise, we multiply how much he is making by the percent of his raise

raise = 8*3.5%

Change to decimal form

raise = 8 *.035

raise = .28

His raise is $.28

6 0
3 years ago
A test of the breaking strength of 6 ropes manufactured by a company
erastovalidia [21]

Answer:

RESULTS: The study revealed that a 1% increase in access to improved sanitation would reduce infant mortality by a rate of about two infant deaths per 1000 live births.

4 0
3 years ago
PLEASE HELPPPP MEEEEEE!!!!
Tanya [424]

Answer:

A

Step-by-step explanation:

I THINK I HAD THIS QUESTION

6 0
3 years ago
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