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3 years ago

Please include an explanation !!

Mathematics

1 answer:

erma4kov [3.2K]3 years ago

6 0

Answer:

k just doing this for points

Step-by-step explanation:

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Give the difference in kg between a 25 kg weight and a 2400 gram weight

Varvara68 [4.7K]

Answer:

The answer is 22.6kg

Step-by-step explanation:

kilo means 1000 i.e. 10³

Hence,

1 kilogram = 1000 gram

$1 gram = \frac{1}{1000} kilogram\\2400 gram = 2400*\frac{1}{1000} \\2400g = 2.4kg$

Now,

The both quantities are in kg i.e. 25kg and 2.4kg.

We can add zeros after an integer by putting decimal point after least significant figure hence we can write 25 as 25.0

Taking difference of these two:

25.0-2.4 = 22.6kg

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4 years ago

Find the exact value of cos 135° sin15°.

IgorLugansk [536]

Answer:

its cos 50

Step-by-step explanation:

amen

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3 years ago

The function C(x) = x 2 + 78 x + 29 models the cost, in hundreds of dollars, to produce x thousand pens. Find and interpret C(0)

VashaNatasha [74]

Answer:

Step-by-step explanation:

Given the function C(x) = x 2 + 78 x + 29 models the cost, in hundreds of dollars, to produce x thousand pens, we are to interpret C(0), C(2) and C(4).

For C(0), we are to substitute x = 0 into the given function;

C(0) = 0²+78(0)+29

C(0) = 0+0+29

C(0) = 29

Since the cost C(x) is in hundreds of dollars, C(0) = 2900

C(0) means that the cost of producing 0 thousand pen is $2,900

For C(2), we are to substitute x = 2 into the given function;

C(2) = 2²+78(2)+29

C(2) = 4+156+29

C(2) = 189

Since the cost C(x) is in hundreds of dollars, C(2) = 189*100 = $18900

C(2) means that the cost of producing 2 thousand pens is $18,900

For C(4), we are to substitute x = 4 into the given function;

C(4) = 4²+78(4)+29

C(4) = 16+312+29

C(4) = 357

Since the cost C(4) is in hundreds of dollars, C(4) = 357

C(4) means that the cost of producing 4 thousand pens is $35,700

6 0

3 years ago

8 pencils cost 72¢. How many pencils can be bought for 45¢?

natali 33 [55]

Answer:

5 pencils can be bought with 45 cents

Step-by-step explanation:

8 0

3 years ago

Determine the mechanical energy of this object a 1kg pendulum at a height of 1-meter

Lemur [1.5K]

Answer:

Step-by-step explanation:

Mechanical energy (ME) is Kinetic energy + potential energy

Where

Kinetic Energy (KE) = 1/2 * m * v^2

where m is the mass (in kg) and v is the speed of the object (in m/s)

and

Potential Energy (PE) = m*g*h

Where m is the mass (in kg) and g is the gravitational constant (9.81 m/s) and h is the height (in meters)

Hence

ME = KE + PE (note the pendulum DOES NOT have any speed, so v = 0, and thus KE = 0)

So,

$ME=KE+PE\\ME=\frac{1}{2}mv^2+mgh\\ME=\frac{1}{2}(1)(0)^{2}+(1)(9.81)(1)\\ME=0+9.81\\ME=9.81$

Hence, Mechanical Energy is 9.8 Joules (rounded to 1 decimal place). Correct answer is A.

7 0

3 years ago