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3 years ago

What is4=3a-14? .....

Mathematics

1 answer:

babymother [125]3 years ago

5 0

Answer:

a=6

Step-by-step explanation:

-3a=-14-4

-3a=-18

a=6

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11-Determine the specific heat of a material if a 12-g sample absorbed 96 J as it was heated from 20°C to 40°C. *

kompoz [17]

Answer:

$c=0.4\ J/g^{\circ} C$

Step-by-step explanation:

Given that,

Mass of a sample, m = 12 g

Heat absobed by the sample, Q = 96 J

It was heated from 20°C to 40°C.

We need to find the specific heat of a material. The heat absorbed by a sample is given by :

$Q=mc\Delta T\\\\c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{96}{12\times (40-20)}\\\\=0.4\ J/g^{\circ} C$

So, the specific heat of the material is $0.4\ J/g^{\circ} C$ .

3 0

3 years ago

a plane averaged 400 mph on a trip going east, but only 280 mph on the return trip. The total flying time in both directions was

Liula [17]

Answer:

1400 miles

Step-by-step explanation:

Speed is the time rate of change of distance. It is the ratio of distance to time and is given by the equation:

$Speed(S) = \frac{distance(d)}{time(t)}\\ S=\frac{d}{t}$

plane averaged 400 mph on a trip going east, but only 280 mph on the return trip.

The time spent (t₁) in going east is given by:

$S=\frac{d}{t_1}\\ t_1=\frac{d}{S} =\frac{d}{400mph}$

The time spent (t₂) in going east is given by:

$S=\frac{d}{t_2}\\ t_2=\frac{d}{S} =\frac{d}{280mph}$

The total time (t) = t₁ + t₂

t = t₁ + t₂ = 8.5 hours

$\frac{d}{400}+\frac{d}{280} =8.5\\280d+400d=952000\\680d=952000\\d=1400miles\\$

Therefore the one way distance is 1400 miles

7 0

3 years ago

Arlene set up tables for a dinner. She put 6 chairs at each table. If t represents the number of tables Alrene set up, which equ

tiny-mole [99]

Answer:

6t = c

Step-by-step explanation:

If there are six chairs per table, you need to find how many tables there are, after that, then you can find how many chairs you need.

7 0

3 years ago

What is (9x10^9) (-12) / 36

salantis [7]

Answer:

-3000000000

Step-by-step explanation:

Math

4 0

3 years ago

The length of a rectangle is two feet less than three times the width. Find the area of the rectangle in terms of a polynomial

Mrrafil [7]

Answer:

Where the width is W feet long, the area of the rectangle in terms of a polynomial

= 3W² - 2W

Step-by-step explanation:

The area of a rectangle is the product of the length and the width of the rectangle. Given that a rectangle has a Length L feet and a width W feet, the area A

= L * W

If the length of a rectangle is two feet less than three times the width.then

L = 3W - 2

The area A

= (3W - 2) * W

= 3W² - 2W

6 0

4 years ago