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3 years ago

20 Points + Brainy answer quick

Mathematics

1 answer:

Alborosie3 years ago

8 0

Answer:

1. 10 miles

2. 12 feet

Step-by-step explanation:

For question 1, they both walk for two hours so Sara walked 8 hours and her sister walked 6 miles. Since they went 90˚ opposite directions, we have to use the Pythagorean Theorem to find the distance. 8 squared plus 6 squared equals c squared. 64 plus 36 equals c squared. The square root of 100 is 10, so the distance is 10 miles.

For question 2, you also have to do the Pythagorean Theorem. So, since the hypotenuse is 15, we do 15 squared minus 9 squared equals b squared. 225 minus 81 equals b squared. 144 equals b squared. The square root of 144 is 12. The answer is 12 feet. I hope this helped and please mark me brainliest. I spent I lot of time on this!

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Which is the longest? A. 2 km B. 25 m C. 2,500 cm D. 3,000 mm

Leona [35]

2km=2000m
25m=25m
2500cm=25m
3000mm=3m

Hence the longest is 2km=2000m

8 0

3 years ago

A man comes into a store and steals $100 from the register without the owner knowledge. Comes back and buys $70 worth of stuff a

emmainna [20.7K]

Answer

The owner lose is $100 .

Reason

As given

A man comes into a store and steals $100 from the register without the owner knowledge.

Comes back and buys $70 worth of stuff and the owner gives him $30 in change.

i.e First man steals $100 than give back to owner when he buys $70 worth of stuff and the owner gives him $30 in change.

Therefore the total owner lose is the sum of $70 worth of stuff and $30 in change.

Total owner lose = $70 + $30

= $100

Therefore the owner lose be $100 .

Hence proved

4 0

3 years ago

Read 2 more answers

The ages of several trees on school property are shown below: 3 years, 8 years, 10 years, 14 years, 11 years What is the mean ag

almond37 [142]

3+8+10+14+11= 46
46/(how many trees) 5= 9.2
9.2 years is your answer.

5 0

4 years ago

Read 2 more answers

Can help me find area and perimeter step by step

Vera_Pavlovna [14]

Answer:

area: 16.28 ft²
perimeter: 17.05 ft

Step-by-step explanation:

The figure is shown as being composed of a semicircle and a triangle. You know the formula for the area of a circle is ...

A = πr²

The radius of the semicircle is half its diameter, so is (4 ft)/2 = 2 ft. Then the area of a circle with radius 2 feet is ...

A = π(2 ft)² = 4π ft²

Our semicircle has half that area, so ...

area of semicircle = (4π ft²)/2 = 2π ft² ≈ 6.283 ft²

The area of the triangle is given by the formula ...

A = (1/2)bh

Here, the base is shown as 4 ft, and the height is shown as 5 ft. Then the triangle area is ...

triangle area = (1/2)(4 ft)(5 ft) = 10 ft²

So, the total area of the composite figure is ...

figure area = area of semicircle + triangle area

= 6.283 ft² + 10 ft² ≈ 16.283 ft² . . . . area of the figure

The perimeter of the curved portion of the semicircle is half the circumference of a circle of radius 2 ft. It will be ...

curved perimeter = (1/2)(2πr) = πr = π(2 ft) = 2π ft ≈ 6.283 ft

The length of each side of the triangle can be found from the Pythagorean theorem. Each side of the triangle is the hypotenuse of a right triangle with legs 2 ft and 5 ft. Then it will be ...

triangle side length = √(2² +5²) ft = √29 ft ≈ 5.385 ft

The total perimeter is ...

perimeter = 2 × triangle side length + semicircle length

= 2×(5.385 ft) + 6.283 ft = 17.054 ft

The perimeter of the figure is about 17.05 feet.

4 0

3 years ago

The perimeter of the rectangle is 28 units. What is the value of w?

Georgia [21]

Answer:

5 units

Step-by-step explanation:

im pretty sure i did the calculations right

7 0

3 years ago