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Dima020 [189]
3 years ago
10

5) Tim loves reading fiction, and he can read 100 pages in 2 hours. How many pages he can read in 48 minutes?

Mathematics
2 answers:
Aleonysh [2.5K]3 years ago
6 0

Answer:

40 pages

Step-by-step explanation:

Lets change hours to minutes

1 hours = 60 minutes

2 hours = 120 minutes

We will use ratios to solve

100 pages         x pages

------------------- = --------------

120 minutes       48 minutes

Using cross products

100 * 48 = 120 * x

Divide each side by 120

100 *48/120 = 120x/120

40 =x

Tim can read 40 pages

IrinaVladis [17]3 years ago
5 0

Answer:

40\ pages

Step-by-step explanation:

Remember that

1 hour=60 minutes

so

2 hours=120 minutes

Using proportion

\frac{100}{120}\frac{pages}{minutes}=\frac{x}{48}\frac{pages}{minutes}\\ \\x=100*48/120\\ \\x=40\ pages

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5 0
3 years ago
Given f(x) =
sergejj [24]

Answer:

A

Step-by-step explanation:

We are given the function:

\displaystyle f(x) = \left\{        \begin{array}{ll}            2\cos(\pi x) \text{ for }  x \leq -1 \\ \\          \displaystyle   \frac{2}{\cos(\pi x)}\text{ for } x > -1        \end{array}    \right.

And we want to find:

\displaystyle \lim_{x\to -1}f(x)

So, we need to determine whether or not the limit exists. In other words, we will find the two one-sided limits.

Left-Hand Limit:

\displaystyle \lim_{x\to-1^-}f(x)

Since we are approaching from the left, we will use the first equation:

\displaystyle =\lim_{x\to -1^-}2\cos(\pi x)

By direct substitution:

=2\cos(\pi (-1))=2\cos(-\pi)=2(-1)=-2

Right-Hand Limit:

\displaystyle \lim_{x\to -1^+}f(x)

Since we are approaching from the right, we will use the second equation:

=\displaystyle \lim_{x\to -1^+}\frac{2}{\cos(\pi x)}

Direct substitution:

\displaystyle =\frac{2}{\cos(\pi (-1))}=\frac{2}{\cos(-\pi)}=\frac{2}{(-1)}=-2

So, we can see that:

\displaystyle \displaystyle \lim_{x\to-1^-}f(x)=\displaystyle \lim_{x\to -1^+}f(x) =-2

Since both the left- and right-hand limits exist and equal the same thing, we can conclude that:

\displaystyle \lim_{x \to -1}f(x)=-2

Our answer is A.

8 0
3 years ago
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