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Wittaler [7]
4 years ago
5

Helppppppppppppppppppppp

Mathematics
1 answer:
UNO [17]4 years ago
8 0

Answer:

z = 60

Step-by-step explanation:

100+20+z=180

120+z=180

z=60

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Which quadratic equation has roots –2 and 1/5?
AysviL [449]

Answer:

The equation 5x^2\:+\:9x\:-\:2\:=\:0 has roots –2 and 1/5.

Hence, the option 'a' is the correct answer.

Step-by-step explanation:

Checking the equation

5x^2\:+\:9x\:-\:2\:=\:0

putting x = -2 in the equation

5\left(-2\right)^2\:+\:9\left(-2\right)-\:2\:=\:0\:

2^2\cdot \:\:5-9\cdot \:\:2-2=0

2^2\cdot \:5-18-2=0

20-20=0

0=0

L.H.S=R.H.S

putting x = 1/5 in the equation

5\left(\frac{1}{5}\right)^2\:+\:9\left(\frac{1}{5}\right)-\:2\:=\:0\:

5\left(\frac{1}{5}\right)^2+9\cdot \:\frac{1}{5}-2=0

\frac{1}{5}+\frac{9}{5}-2=0

2-2=0

0=0

L.H.S=R.H.S

As putting x = -2 and x = 1/5 satisfy the equation.

Therefore, the equation 5x^2\:+\:9x\:-\:2\:=\:0 has roots –2 and 1/5.

Hence, the option 'a' is the correct answer.

4 0
3 years ago
Hello, can anyone help, please?
vazorg [7]

Answer:  dude you can do this yourself.

Step-by-step explanation:

toss coins ;-;

6 0
3 years ago
Simplify the ratio 13:143
dmitriy555 [2]
You have to divide to find a common number. 143/13=11 1:11
3 0
4 years ago
Read 2 more answers
Kelli works at a department store that sells shoes. She receives an employee discount for any shoes she buys at the store. If je
Irina-Kira [14]
30% off
your welcome ;D two week old question tho
thats rare
8 0
3 years ago
A box of cereal states that there are 99 calories in a 3/4 cup serving. What is the unit rate for calories per cup? How many cal
Otrada [13]

The unit rate for one serving would be 132 calories, and the total calories in 3 cups would be 396 calories.

Step-by-step explanation:

You solve you the unit rate by multiplying 99 calories by 4 then dividing the amount by 3 and get 132 calories. Finally, you multiple by 3 and get 396 caloriesm

6 0
4 years ago
Read 2 more answers
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