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How many liters of a 40% solutions must be mixed with 60 liters of a 80% solution to get a 70% solution? 20 liters
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In a chemistry class, 3 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed? 1.5 liters
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Decide whether (-2, 1) is a solution to the system:
4x + y = -9
3x + 4y = -10 No
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Decide whether (-4, 2) is a solution to the system:
2x + y = -9
3x + 2y = -8No
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Decide whether (-6, 1) is a solution to the system:
x + y = -5
x - y = -7 Yes
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Solve for b.
b = 2A/h
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Solve for b1.
b1 = 2A/h − b2
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Solve for s3.
S3 = P − s1 − s2
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Walt made an extra $9000 last year from a part-time job. He invested part of the money at 8% and the rest at 7%. He made a total of $680 in interest. How much was invested at 7%? $4000
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Solve the system.
(6, −4)
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Solve the system.
−x – 3y = −23
6x + 3y = 33(2, 7)
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Solve the system
7x – 7y = 91
2x + 3y = −9.
(6, −7)
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Solve the system.
(4/5, 1/7)
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Solve the system.
5x + 3y = 80
2x + y = 30(10, 10)
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Solve the inequality.
| z + 1 | > 0
[−1, ∞)
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Solve the inequality.
| r + 4 | > 4
(− ∞, −8) (0, ∞)
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Solve for x:
| x | > 8
(− ∞, −8) (8, ∞)
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Solve for x:
| 7 – x | < 13[−6, 20]
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Is the following an expression or an equation?
X=15
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Is the following an equation or an expression?
(y – 6) – (y – 3) = 7Equation
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Is the following an expression or an equation?
Expression
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Is the following an expression or an equation?
5(y + 6) + 6(y – 3)Expression
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After receiving a discount of 15.5% on its bulk order of printer toner, Best Office Supply pays $2197. What was the price of the order before the discount? $2600
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An investor bought 100 shares of stock. The value of the shares went up 7% and then he sold them. How much did the investor pay for the 100 shares if he sold them for $1284? $1200
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If 6 times a number is added to −4, the result is equal to 10 times the number. What is the number? The number is −1
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Solve the system.
4x − 8y = 24
x = 2y + 6This is an dependent system. There are an infinite number of solutions.