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3 years ago

I am having trouble with question 7 onwards to q10 anyone mind helping/teach me?

Mathematics

1 answer:

zaharov [31]3 years ago

8 0

~7)~
$(3×4×5)
=1.585 + 2 + 2.322
=5.907$
~8)
$(3÷2÷5)
=1.585 - 1 - 2.322
=-1.737$
9) $3log7(2) -2log7(3) + 4log7(3) -2log7(2)
=0.356+2(0.565)
=1.486$
9) $x(x+2)=8
x=2$
10) $x/(2x+3)=1/9
9x=2x+3
x=3/7$

Hope this helps

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Answer:

Solutions given:

Velocity ratio V.R =5

effort =500N

efficiency =80%

magnitude of load=?

mechanical advantage [M.A ]

we have

efficiency =M.A/V.R*100%

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again

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malfutka [58]

Answer:

The correct option is E. 16 min 12 sec.

Step-by-step explanation:

Consider the provided information.

When the readout indicated 24 min 18 sec, she had completed 10% of her exercise session.

That means 24 min 18 sec is 90% of her exercise time.

First convert the 24 min 18 sec into seconds:

24 min 18 sec = 1440+18 = 1458 seconds

Let x represents the 100%.

$\frac{1458}{x}=\frac{90\%}{100\%}$

$x=\frac{1458}{0.9}$

$x=1620$

That means the total time of workout was 1620 seconds or 27 minutes.

Now she had completed 40% of her exercise session, that means the readout will indicate 60% of the time.

Calculate the 60% of 1620 as shown:

$1620\times \frac{60}{100}=972$

Now convert 972 seconds into minutes as shown:

972 seconds = 960 seconds + 12 seconds = 16 min 12 seconds

Hence, the correct option is E. 16 min 12 sec.

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