a bookstore had 160 copies of magazines. yesterday it sold 7/8 of them. how many copies were sole yesterday

Mathematics

2 answers:

Ainat [17]4 years ago

5 0

140 was sold yesterday

ddd [48]4 years ago

3 0

Answer:

The bookstore has 48 left.

Explanation:

If yesterday the bookstore solve 1/4 of 80 magazines then it sold:

$\frac{1}{4}$ X 80 → $\frac{80}{4}[/tex} → 20

So at the end of the day it had 80-20 magazines left or 60 total magazines left.

Today it sold 185 of 60 (the total left from yesterday) or:
[tex]\frac{1}{5}$ X 60 → $\frac{60}{5}$ → 12

So, at the end of today it had

60-12

magazines left or 48 total magazines left.

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What is the product of 5.86 × 10–7 and 3.1 × 104 1. Write the expression: (5.86 × 10–7)(3.1 × 104) 2. Rearrange the expression:

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Answer:

The value of the exponent of the base 10 for this product is -2.

Step-by-step explanation:

$5.86\,\,10^{-7}\,\,*\,\,3.1\,\,10^4=18.166\,\,10^{-7+4}=18.166\,\,10^{-3}$

Now, in order to represent this number in scientific notation, we need to reduce the coefficient 18.166 to a coefficient larger or equal to 1 and smaller strictly than 10, by using division or multiplications by powers of 10. In order to reduce it to 1.8166, we need to divide the original 18.166 by ten so we do the following in order not to change the given number (multiply and divide by ten at the same time):

$\frac{18.166\,\,10}{10} \,10^{-3}=1.8166\,*\,10\,*\,10^{-3}=1.8166\,\,10^{-2}$