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LenaWriter [7]
2 years ago
6

What is the first step in evaluating the expression below?

Mathematics
1 answer:
Ostrovityanka [42]2 years ago
6 0

Answer:

brackets, then Parenthesis then the FIRST Multiplication then the division and then math and sub and so on a so for

Step-by-step explanation:

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You would leave a $4.20 tip.
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When was Back In Black By AC/DC made?
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A scientist needs 10 liters of a 20% acid solution for an experiment, but she has only a 5% solution and a 40% solution. To the
tamaranim1 [39]

Answer:

The volume of 40% solution= 4.3L

The volume of 5% solution= 10L - 4.3L= 5.7L

Step-by-step explanation:

From the given information:

Let consider  x to be the of volume 40% solution

therefore the volume of 5% is said to be:

10 L= 40% solution volume + 5% solution volume

10 L= (x + 5%) solution volume

making 5% solution volume the subject; we have

5% solution volume= 10 L - x

To estimate the value of the volume, we now have:

Volume  of 20% × Concentration of  20%= (Volume of 40%  × concentration40%) + (Volume of 5% × Concentration of 5% )

∴

10L  ×  20%= (x) L × 35% + 10 L × 5%

(x) L × 35 = 10L × 20 - 10 L × 5 = 10 L × 15

x L = 10L \times \dfrac{15}{35}

x = 4.28 L

x \simeq 4.3L

∴

The volume of 40% solution= 4.3L

The volume of 5% solution= 10L - 4.3L= 5.7L

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3 years ago
Explain why the diagram shows that<br> 6(3 + 4) = 6.3 +6.4.
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A rectangle measures 10 feet by 6 feet. The length and width are each increased by 50%. What is the area the new rectangle?
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Answer:

135 ft^2

Step-by-step explanation:

50% more than 10 feet is 15 feet;  50% more than 6 feet is 9 feet.

Thus, the area of the new rectangle is 15 times 9 feet squared, or 135 ft^2.

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