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svetoff [14.1K]
3 years ago
6

Which of the following is equivalent to 5 • (7 • 4)?

Mathematics
1 answer:
serg [7]3 years ago
4 0

Answer:

Its (5 x 7) x 4

Step-by-step explanation:

5 x (7 x 4)

5 x (28)

140

------------

(5 x 7) x 4

(35) x 4

140

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A metallurgist has an alloy with 5% titanium and an alloy with 30% titanium. He needs 100 grams of an alloy with 15% titanium. H
andrey2020 [161]
Let us convert the percentages to decimal format first.. so 5% is just 5/100 or 0.05 and 15% is just 15/100 or 0.15

so hmmm, so, let's say it needs "x" amount and "y" amount of each respectively, so, whatever "x" and "y" are, they must add up to 100, and whatever their concentration is, must add up to what the mixture yields

thus

\bf \begin{array}{lccclll}
&amount&concentration&
\begin{array}{llll}
concentrated\\
amount
\end{array}\\
&-----&-------&-------\\
\textit{5\% alloy}&x&0.05&0.05x\\
\textit{30\% alloy}&y&0.30&0.3y\\
-----&-----&-------&-------\\
mixture&100&0.15&15
\end{array}
\\\\\\
\begin{cases}
x+y=100\implies \boxed{y}=100-x\\
0.05x+0.3y=15\\
----------\\
0.5x+0.3\left( \boxed{100-x} \right)=15
\end{cases}

solve for "x"

what's "y"? well, y = 100 - x
4 0
3 years ago
A cylinder has a radius of 4 inches and a height of 5 inches. Which of these dimensions of a cylinder will have the same volume?
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I don’t know this is a random guess but I’ll say radius = 10 inches and height= 8 inches
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Construct a tangent to a circle through a point on the circle using the construction tool. Insert a screenshot of the constructi
otez555 [7]

Answer:

Below is an image of my work

Step-by-step explanation:

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What is the distance between points (2, 4) and (3, 1) to the nearest tenth?
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Step-by-step explanation:

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