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2 years ago

(a) 34 is 85% of what number? (b) What is 15% of 80?

Mathematics

2 answers:

lana [24]2 years ago

6 0

Answer:

A. 40. B.12

Step-by-step explanation:

40/34=.85

80*.15=12

Gennadij [26K]2 years ago

4 0

Answer:

Part A: 40
Part B: 12

Step-by-step explanation:

Given the following question:

Part A:
34 is 85% of what number?
$\frac{85\times40}{100} =85\times40=3400\div100=34$
85% of 40 is 34.

Part B:
15% of 80
$\frac{15\times80}{100} =15\times80=1200\div100=12$
15% of 80 is 12.

Hope this helps.

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Julie and her brother go to Atlanta to ride the Sky View Ferris wheel. It measures 200 feet in diameter. I want to know the dist

Zinaida [17]

Answer:

a) Circumference of Ferris wheel.

b) $\text{Circumference} = \pi d$

c) 628 feet

Step-by-step explanation:

We are given the following in question:

Diameter of Ferris Wheel = 200 feet

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The distance around Ferris wheel is given by the circumference of Ferris wheel.

b) Formula to calculate circumference

$\text{Circumference} = \pi d$

where d is the diameter of he wheel.

c) Distance traveled in one rotation

This will be given by the circumference of the Ferris wheel.

$\text{Distance} = \pi d = 3.14\times 200 = 628\text{ feet}$

Thus, the distance traveled in one rotation is 628 feet.

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3 years ago

Find the distance between the points.<br> (r, s) and (0, 0)

zhenek [66]

Answer: $\sqrt{r^2+s^2$

=====================================================

Reason:

Plot the points (0,0) and (r,s). You can place (r,s) anywhere you want.

Connect the two points mentioned and form a right triangle such that the segment from (0,0) to (r,s) is the hypotenuse of said right triangle.

The horizontal leg has a length of r-0 = r units, while the vertical leg will be 's' units.

Check out the diagram below.

We then apply the pythagorean theorem to say $r^2+s^2 = h^2$ where h is the hypotenuse. Solving for h gets us $h = \sqrt{r^2+s^2}$ . We only focus on the positive square root since a negative hypotenuse makes no sense.

Since we made the hypotenuse the segment with endpoints (r,s) and (0,0), this means the hypotenuse length and the distance are the same thing.

Therefore, the distance from (r,s) to (0,0) is $\sqrt{r^2+s^2}$

As an alternative, you can use the distance formula to get the same answer. The distance formula is effectively the pythagorean theorem phrased a different way.

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2 years ago

I need the answers for 2 and 3

Korolek [52]

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3 years ago

Factor this <br> X^2+10+9=0

Art [367]

To factor this quadratic equation into double brackets, you need to find two numbers that add together to equal 10, but also multiply to give you 9. These two numbers can be identified as 1 and 9, which will be the numbers you place in your parentheses as follows:
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8 0

3 years ago

Please solve the question and give correct answer with explanation so that i can understand it

denis-greek [22]

Answer:

Step-by-step explanation:

Let the speed of the car is c and speed of the plane is p.

<h3>We are given:</h3>

The speed of the plane is 7 times the speed of the car

p = 7c

The distance traveled is

d = 315 km

The time difference to travel this same distance is 3 hours.

d = ts, where d- distance, t- time, s - speed

Find the time for car and plane and their difference.

t = d/s = 315/c

<h3 /><h3>Plane</h3>

t = d/s = 315/p = 315/(7c) = 35/c

<h3 /><h3>The difference</h3>

315/c - 45/c = 3

<u>Solve it for c:</u>

(315 - 45)/c = 3
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Now find the speed of plane:

p = 7c = 7*90 = 630 km/h

As we see, Jenny is right

6 0

2 years ago