An object has a mass of 18 grams and its volume is 2 cm3 calculate density

Mathematics

2 answers:

Anna [14]3 years ago

6 0

The density is 9 g/cm3

statuscvo [17]3 years ago

5 0

Answer: $9\ gm/cm^3$

Step-by-step explanation:

The formula to find the density is given by :-

$\text{Density}=\dfrac{\text{Mass}}{\text{Volume}}$

Given : Volume of object = 2 $cm^3$

Mass of object = 18 grams

Then., the density will be :-

$\text{Density}=\dfrac{18}{2}=9\ gm/cm^3$

Hence, the density of the object would be $9\ gm/cm^3$ .

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The angle of elevation of the top of a tower from two points 121 m and 144 m away from the foot of the tower on th same side are

Dennis_Churaev [7]

Answer:

132 m

Step-by-step explanation:

Refer to attachment for figure.

In smaller triangle with angle theta , we have ,

⇒ tanθ = p/b

⇒ tanθ = h/121m

⇒ tanθ = h/121 m

In triangle with angle 90-∅

⇒ tan(90-θ) = p/b

⇒ cot θ = h/144 m

Multiplying these two ,

=> tanθ . cotθ = h/121 m × h/144m

=> 1 = h²/ (121 m × 144m )

=> h² = 121m × 144m

=> h= √ ( 121m × 144m)

=> h = 11m × 12m

=> h = 132 m

6 0

3 years ago

Solve the system shown.

krek1111 [17]

1. Rewrite the system:

x+12y=68 (i)
x=8y-12 (ii)

2. Let's substitute the equation (ii) into the equation (i):

x+12y=68
(8y-12)+12y=68

3. Then, you have:

8y-12+12y=68

4. When you clear "y", you have:

20y-12=68
20y=68+12
20y=80
y=80/20
y=4

5. You already have the value of "y". Now, you must substitute this value into the equation (ii):

x=8y-12
x=8(4)-12
x=32-12
x=20

6. Therefore, the result is:

x=20
y=4

3 0

3 years ago

What is 6 1/4 written as a decimal? Please help me I am very confused.

MrRa [10]

Answer: 6.2

Step-by-step explanation: