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Rus_ich [418]
3 years ago
14

The question I need help on is 15.5z= -77.5 . I really don't get it please help:)

Mathematics
2 answers:
melamori03 [73]3 years ago
6 0
The answer to this question is z=-5 
leva [86]3 years ago
3 0
15.5z ÷ 15.5 = -77.5 ÷ 15.5; z = -5.
The answer is z = -5.

Hope this helps.
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Decrease 150km in the ratio 2:5​
SIZIF [17.4K]

2:5 = 2/5

2/5 x 150

2 x 30= 60km

6 0
3 years ago
#37 I need help with. best answer plz???
Luda [366]
I agree because he calculated it the right way and that is the same answer I got.

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4 0
3 years ago
3/4 = x/10<br> Please write the answer in decimal form.<br> X = ?
Morgarella [4.7K]

Answer:

x=7.5

Step-by-step explanation:

To solve this, cross multiply

3/4=x/10

4*x=3*10

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8 0
3 years ago
Read 2 more answers
Express 1.8meter in seconds given answer in scientific notation
polet [3.4K]

Answer:

Dear user,

Answer to your query is provided below

Scientific notation = 1.8x10^0

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7 0
3 years ago
X+y-z=5 -x-4y-8z=6 3x+5y-4z=-20
Juli2301 [7.4K]

Answer:

x = 24.48, y = -15.52, z = 3.95 to the nearest hundredth.

Step-by-step explanation:

 x+y-z=5             (a)

-x-4y-8z=6          (b)

3x+5y-4z=-20      (c)

Adding equations a and b:

-3y - 9z = 11       (d)

Now multiply equation b by 3:

-3x - 12y - 24z = 18        (e)

Adding  c and e:

-7y - 28z = -2      (f)  Multiply by 3 to give (g)

-3y - 9z = 11         (b)   Multiply by  -7 to give (h)

-21y - 84z = -6     (g)

21y + 63z = -77    (h)    Adding g and h:

-21z = - 83

z =  3.952

and y is found bt substituting in equation d:

-3y - 9(3.952) = 11

y = ( 11 + 9(3.952) / -3

= -15.52.

Now find x by substituting for y an z in equation a:

x - 15.52 - 3.952 = 5

x = 5 + 15.52 + 3.952

= 24.476.

3 0
3 years ago
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