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3 years ago

Evaluate −6 − (−4). −10 −2 24 2

Mathematics

2 answers:

Andrew [12]3 years ago

8 0

You have to combine the negative signs next to each other, so technically it's -6+4, so it would be -2.

Tju [1.3M]3 years ago

8 0

-6 -(-4) = -6+4 = -2

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If y varies directly as the x^2 and y =200 when x =5 ,What is the value of y when x =-3

PtichkaEL [24]

The answer you want would be -120

b/c 200/5 is 40 so -3*40 is -120

6 0

3 years ago

Read 2 more answers

Flying against the wind, an airplane travels 7520 kilometers in 8 hours. Flying with the wind, the same plane travels 6500 kilom

bezimeni [28]

Answer:

Rate of plane in still air = 1120 km/h

Rate of wind = 180 km/h

Step-by-step explanation:

Let the rate (speed) of the plane in still air = u km/h

Let the rate (speed) of the wind = v km/h

Formula for speed is:

$Speed = \dfrac{Distance}{Time}$

Given that against the wind, airplane travels 7520 km in 8 hours.

The speed against the wind will be slower so,

Against the wind, speed = (u -v ) km/h

Using above formula:

$(u-v) = \dfrac{7520}{8} km/h\\(u-v) = 940 km/h ..... (1)$

Given that with the wind, airplane travels 6500 km in 5 hours.

The speed with the wind will be faster so,

With the wind, speed = (u +v ) km/h

Using above formula:

$(u+v) = \dfrac{6520}{5} km/h\\(u+v) = 1300 km/h ..... (2)$

Adding (1) and (2) to solve for u and v:

$2u = 2240\\\Rightarrow u = 1120\ km/h$

Putting u in (1):

$1120-u=940\\\Rightarrow u = 180\ km/h$

So, the answers are:

Rate of plane in still air = 1120 km/h

Rate of wind = 180 km/h

6 0

3 years ago

2 x 10 to the 3rd power standard form

cricket20 [7]

2 x 10 to the 3rd power is
2x10^3

5 0

3 years ago

How many nickels will fit in a 2 liter bottle

lara [203]

A nickel has a diameter of 21.21 mm and a thickness of 1.95 mm

2.121 cm diameter 
0.195 cm thickness 

Think of a nickel as a cylinder 

r = 2.121/2 = 1.0605 cm 

V = pi * r^2 * h 
V = pi * 1.0605^2 * 0.195 cubic cm 

2 liters = 2000 cubic cm 

2000 / (1.0605^2 * 0.195 * pi) => 
2902.84713216 

Your upper limit is 2902, but it could be as little as 0 (for instance if the 2L bottle was only 1 cm wide, then you wouldn't be able to fit a single nickel in there) 

I'd say that you could expect about a 70% packing efficiency, just off the top of my head 

2900 * 0.7 => 
290 * 7 => 
300 * 7 - 10 * 7 => 
2100 - 70 => 
2030 

I'd expect around 2000 nickels would fill up the bottle quite nicely, supposing you can get the nickels into it.

8 0

3 years ago

A six-sided number cube is rolled 600 times. The results are 246 even numbers and 354 odd numbers.

Simora [160]

Answer:

the answer is B

Step-by-step explanation:

just trust

7 0

2 years ago