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Debora [2.8K]
3 years ago
8

Solve 7x − 2y = −3 14x + y = 14

Mathematics
1 answer:
ELEN [110]3 years ago
3 0
Move the constant to the left-hand side by adding its opposite to both sides, The sum of two opposites equals
7x-2y+3=0
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at a discount grocery store, jessica paid $0.72 for an 8-ounce bottle of spring water. What is the cost of the spring water per
topjm [15]
8/0.72 = 0.09
Per ounce cost $0.09
This gonna help you
7 0
3 years ago
Read 2 more answers
85.87 J or heat energy is added to a 34.8 g mass of substance the temperature rises from 21.76°C
Andru [333]

Answer:

The required specific heat is 196.94 joule per kg per °C  

Step-by-step explanation:

Given as :

The heat generated = Q = 85.87 J

Mass of substance  (m)= 34.8 gram = 0.0348 kg

Change in temperature = T2 - T1 = 34.29°C - 21.76°C = 12.53°C

Let the specific heat = S

Now we know that

Heat = Mass × specific heat × change in temperature

Or, Q = msΔt

Or, 85.87 = (0.0348 kg ) × S × 12.53°C

Or , 85.87 = 0.4360 × S

Or, S = \frac{85.87}{0.4360}

∴ S = 196.94 joule per kg per °C

Hence the required specific heat is 196.94 joule per kg per °C   Answer

7 0
3 years ago
What is (-8)(-x)(-x)
Mashutka [201]
Correct answer is -8x^2
6 0
4 years ago
Suppose you have a right triangle area marked in the ground with a base (8-h) meters long and a height h meters long. the hypote
Aleks [24]

Answer:

5.415m and 2.585m long

Step-by-step explanation:

For a right triangle

hyp^2 = opp^2 + adj^2 (Pythagoras theorem)

Given

hypotenuse = 6m

height(opposite) = h meters

Adjacent = (8-h)m

Substitute into the expression above;

6² = h²+(8-h)²

36 = h²+64-16h+h²

36 = 2h²-16h+64

2h²-16h+64-36 = 0

2h²-16h+28= 0

Divide through by 2

h²-8h+14 = 0

Using the general formula

h = 8±√8²-4(14)/2

h = 8±√64-56/2

h = 8±√8/2

h = 8±2.83/2

h = 8+2.83/2 and 8-2.83/2

h = 10.83/2 and 5.17/2

h = 5.415 and 2.585

hence the length of the height of the right triangle are 5.415m and 2.585m long

7 0
3 years ago
What is the y-Intercept of x+3y>9?
IrinaK [193]

Answer:

3

Step-by-step explanation:

6 0
4 years ago
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