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amid [387]
3 years ago
8

Explain how to make these couculations mentally a. 99x6 b. 99x15

Mathematics
2 answers:
Sergeeva-Olga [200]3 years ago
6 0

Answer:

a is 594 and b is 1485

Step-by-step explanation:

puteri [66]3 years ago
5 0

Answer:

a. 594 b. 1485

Step-by-step explanation:

do it step by step.

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Two computers just scanned for viruses at the same time. Computer A runs a virus scan every 2.75 days. Computer B runs a virus s
Elis [28]

Let the time taken by computer for virus scan be, 'x' days

We are given that Computer A runs a virus scan in every 2.75 days and Computer B runs a virus scan in every 3.5 days.

<h3>Amount of work done by computer A⤵️</h3>

Amount of work done in one day = \tt\frac{1}{2.75}

Amount of work done in x days = \tt\frac{x}{2.75}

<h3>Amount of work done by Computer B⤵️</h3>

Amount of work done in one day = \tt\frac{1}{3.5}

Amount of work done in x days = \tt\frac{x}{3.5}

Since, They are doing the same work the amount of work done is 1.

\sf \:  \frac{x}{2.75}  +  \frac{x}{3.5}  = 1

Solve for x ~

\sf \frac{x}{ \frac{11}{4} }  +  \frac{x}{ \frac{7}{2} }  = 1

\sf \frac{4x}{11}  +  \frac{2x}{7}  = 1

\sf \: 28x + 22x = 77

\sf \: 50x = 77

\sf \: x =  \frac{77}{50}

\boxed{ \bf \: x = 1.54}

➪ <em>Thus, the time taken when both computers run a virus scan at the same time again is, 1.54 days</em>

8 0
2 years ago
5/14 - - 1/14 I will provide a picture
m_a_m_a [10]

Answer:

\frac{3}{7}

Step-by-step explanation:

  1. Simplify: \frac{5}{14} - (-\frac{1}{14}) = \frac{5}{14} + \frac{1}{14}  
  2. \frac{5}{14} + \frac{1}{14} = \frac{6}{14}  
  3. \frac{6}{14} = \frac{3}{7}

I hope this helps!

3 0
3 years ago
Express a decimal number ( ie 0.768) - process description please - as a rational number (96/125)?
Stels [109]

The decimal representation of any number is a linear combination of powers of 10. In other words, given a number like 123.456, we can expand it as

1\cdot10^2+2\cdot10^1+3\cdot10^0+4\cdot10^{-1}+5\cdot10^{-2}+6\cdot10^{-3}

10^{-n}=\dfrac1{10^n} for any n, so the above is the same as

100+20+3+\dfrac4{10}+\dfrac5{100}+\dfrac6{1000}=\dfrac{100000+20000+3000+400+50+6}{1000}=\dfrac{123456}{1000}

Similarly, we can write

0.768=\dfrac{768}{1000}

Now it's a question of reducing the fraction as much as possible. We have \mathrm{gcd}(768,1000)=8 so

\dfrac{768}{1000}=\dfrac{96\cdot8}{125\cdot8}=\dfrac{96}{125}

5 0
3 years ago
Find m&lt; AEB. Please help
MrRissso [65]

Answer:

118

Step-by-step explanation:

the length ED is equal to EC

so

the angle is also the same

that's mean the angle ECD is equal to 31

then to find the another angle just do like this

=180–31–31

=118

5 0
3 years ago
Read 2 more answers
What is the approximate volume of the cylinder use 3.14 for TT
Fynjy0 [20]
First we want to know the surface of the circle, which is
\pi {r}^{2}
with r representing the radius. In this case
\pi \times {8}^{2} =
64\pi

To find the volume of the cylinder we have to multiply this outcome with the height.
64\pi \times 25 =
64 \times 3.14 \times 25 =
5024
Hence, the volume of the cylinder is about 5024 cubic cm.
6 0
3 years ago
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