Answer:
B
C
Step-by-step explanation:
Convert 30% to a decimal:
30% = 0.30
Check each item by multiplying the original price by 0.30 (the 30% off sale). Subtract the product from the original price. If the sale price is the same, the pricing is correct. If they are different, the pricing is incorrect.
Headphones:
24.50 × 0.30
7.35
24.50 - 7.35
17.15
17.15 = 7.35? Incorrect.
Phone Charger:
29.25 × 0.30
8.775
29.25 - 8.775
20.475
Round to the nearest cent (hundredths place):
20.48
20.48 = 20.48? Correct.
Minitablet:
117.95 × 0.30
35.385
117.95 - 35.385
82.565
Round to the nearest cent:
82.57
82.57 = 82.57? Correct.
Printer:
213.45 × 0.30
64.035
213.45 - 64.035
149.415
Round to the nearest cent:
149.416
149.416 = 207.47? Incorrect.
Flat Screen TV:
376.98 × 0.30
113.094
376.98 - 113.094
263.886
Round to the nearest cent:
263.89
263.89 = 236.89? Incorrect.
Answer:
x=1
y=2
z=-1
Step-by-step explanation:
Add the first two equations: (this will be equation 4)
![3y - z = 7](https://tex.z-dn.net/?f=3y%20-%20z%20%3D%207)
Multiply the first equation by 2:
![2x + 2y - 4z = 10](https://tex.z-dn.net/?f=2x%20%2B%202y%20-%204z%20%3D%2010)
Take the third equation and subtract the above equation.
![y + 3z = - 1](https://tex.z-dn.net/?f=y%20%2B%203z%20%3D%20%20-%201)
Multiply that by 3:
![3y + 9z = - 3](https://tex.z-dn.net/?f=3y%20%2B%209z%20%3D%20%20-%203)
Subtract equation 4:
![10z = - 10](https://tex.z-dn.net/?f=10z%20%3D%20%20-%2010)
![z = - 1](https://tex.z-dn.net/?f=z%20%3D%20%20-%201)
For y+3z=-1, plug in values:
![y + 3( - 1) = - 1](https://tex.z-dn.net/?f=y%20%2B%203%28%20-%201%29%20%3D%20-%201)
![y - 3 = - 1](https://tex.z-dn.net/?f=y%20-%203%20%3D%20%20-%201)
![y = 2](https://tex.z-dn.net/?f=y%20%3D%202)
Plug in y and z values in first equation:
![x + 2 - 2( - 1) = 5](https://tex.z-dn.net/?f=x%20%2B%202%20-%202%28%20-%201%29%20%3D%205)
![x + 2 + 2 = 5](https://tex.z-dn.net/?f=x%20%2B%202%20%2B%202%20%3D%205)
![x = 1](https://tex.z-dn.net/?f=x%20%3D%201)
<span>More please help me solve the problem
The stars have different brightness. The brightest stars are Grade 1 and the least degree luimnoase stars 6. The brightness of the stars shrinks 2.5 times with the passing from one grade to another. Whenever the stars are brighter Grade 1, Grade 6 than the stars?</span>
Answer:
3/4
Step-by-step explanation:
3/4 2/3
find the lcm of the denominators
which is 12
and divide
Answer:
20cm^3
Step-by-step explanation:
V = w x h
w = width
h = height
5x4 = 20