3 years ago

Water evaporates from a pond at a rate of 0.05 inches per hour. What is the change in inches in the water level of

Mathematics

1 answer:

goblinko [34]3 years ago

8 0

1.2 inches of water is evaporated

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D. 2 1/2

Step-by-step explanation:

9/4 = 2.50 = 2 1/2

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a 2 pound box of spaghetti costs 2.50. phillip says that the unit cost is 2/2.50 equals $0.80 per pound. explain his error

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3 years ago

Solve for x in the equation x2 - 4x - 9 = 29.

Oxana [17]

Answer:

$x = 2 + \sqrt{42}$ or $x = 2 - \sqrt{42}$

Step-by-step explanation:

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Subtract 29 from both sides.

$x^2 - 4x - 9 - 29 = 29 - 29$

$x^2 - 4x - 38 = 0$

There are no two integers whose sum is -4 and whose product is -38, so the trinomial is not factorable. We can use the quadratic formula.

a = 1; b = -4; c = -38

$x = \dfrac{-b \pm \sqrt{b^2 - 4ac}}{2a}$

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$x = 2 \pm \dfrac{2\sqrt{42}}{2}$

$x = 2 \pm \sqrt{42}$

$x = 2 + \sqrt{42}$ or $x = 2 - \sqrt{42}$

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4 years ago