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Yakvenalex [24]
2 years ago
10

Can anyone pls tell me when do we cross multiply and when do we multiply 10 * 75 im really confused

Mathematics
1 answer:
Westkost [7]2 years ago
4 0

You don't multiply liters of gasoline by distance.

They are<u> directly proportional </u>- the more gasoline you have the longer is the dictance you can go.

So it's <u>cross multiply</u>.

Another examlpe:

you are paid by hour for your work. The more hours you have worked, the more you are paid:

hours      payment

2 h            $36

5 h             x    

x=\dfrac{5\cdot36}2=90

You would multiply 10•70 if they were inversely poportional values

For example:

1. speed and time of ride by given distance {the greater the speed the less time you need for a ride}

speed          time

10 m/s          75 s

 8 m/s           x

x=\dfrac{10\cdot75}{8}=93.75\,s

2. price and kolos of apples - the higher the pice the less of kilos you can buy by given cash

price          kilos of apples

$2                8

$4                x

x=\dfrac{2\cdot8}{4}=4\,kg

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Right? Pls reply ASAP i need this before 11:45am in need pls hurry
SVETLANKA909090 [29]

Answer:

I think so.

Step-by-step explanation:

If you do the math 2(5-3) exponent 2 - 4 = 4

So if y is 4 you should be correct!

Thb I think you need to know the value of y to solve this question.

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2 years ago
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8 0
3 years ago
Urgent help needed fast
Katena32 [7]

Answer:

Below

Step-by-step explanation:

You can use this formula to find the sum of an arithmetic series

     Sn = n / 2 (a1 + an)

You need to find the number of terms in each series before using the formula

     Tn = a + (n - 1) d

a) 53 = 5 + (n - 1) 3

      n = 17

Sn = 17 / 2 (5 + 53)

    = 493

b) 98 = 7 + (n - 1) 7

      n = 14

Sn = 14 / 2 (7 + 98)

   = 735

       

c) -102 = 8 + (n - 1) -5

        n = 23

Sn = 23 / 2 (8 + (-102))

   = - 1081

d) 41/3 = 2/3 + (n - 1) 1

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Sn = 14 / 2 (2/3 + 41/3)

    = 301 / 3 or 100 1/3  

Hope this helped! Best of luck <3

7 0
2 years ago
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