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schepotkina [342]
3 years ago
15

Joanne bought a box of pens for $3.75. There are 100 pens in a box. The pens individually cost 7 cents. How much money did she s

ave? A. $3.25 B. $0.38 C. $7.00 D. $10.75
Mathematics
2 answers:
lesantik [10]3 years ago
7 0

Answer:

The answer is C) $7.00

PtichkaEL [24]3 years ago
4 0

Answer: A $3.25

Step-by-step explanation:

Each pen cost 7pm. So 100 pens would have cost 7p x 100 = $7

She bought a box of hundred for $3.75

He actually saved:

7 - 3.75 = 3.25

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Question:

For which value of x must the expression √97x be further simplified?

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Answer:

D.  x = 20

Step-by-step explanation:

Given

\sqrt{97x

Required

For what value of x can it be simplified

From the list of options, only (D) is correct

D. 20

Substitute 20 for x in \sqrt{97x

\sqrt{97 x} = \sqrt{97 * 20}

Express 20 as 4 * 5

\sqrt{97 x} = \sqrt{97 * 4 * 5}

Reorder

\sqrt{97 x} = \sqrt{4 *97 * 5}

Split

\sqrt{97 x} = \sqrt{4} *\sqrt{97 * 5}

\sqrt{97 x} = 2*\sqrt{97 * 5}

\sqrt{97 x} = 2*\sqrt{485}

\sqrt{97 x} = 2\sqrt{485}

With other values of x, the given expression can not be simplified.

Hence:

x = 20

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