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schepotkina [342]
3 years ago
9

Find both answers

Mathematics
1 answer:
Sati [7]3 years ago
3 0
Let x+y=10 be equation (1)
and y=x-4 be equation (2)
from (2)
y=x-4...(3)
sub (3) into (1)
x+(x-4)=10
x+x-4=10
2x=12
x=6
sub (x) into (3)
y=6-4
y=2
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If you invest money, after a certain period of time you’ll get interest. For example, if you invest $2,000 at 5% annual interest
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Help me do my ‘mymaths’ homework I’ll give brainliest to the best answer thanks.
Amiraneli [1.4K]

Step-by-step explanation:

you make x the subject of formula for all the questions.

  1. a(x+b)=c

firstly you divide both sides of the equation by a, this way the a will cancel it self out of the equation

x+b= c/a

then you take '+b' to the other side of the equation over the = sign, this makes +b sign to change it then becomes -b

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2. 7(x-a)=b

you divide both sides of the equation by 7.

x-a=b/7

then you take -a to the other side of the equation it becomes +a

x=b/7+a

<u>NOTE</u>: always eliminate the number/letter beside the bracket first. it unlocks the bracket. the number or letter is joined to a bracket by multiplication so we divide to eliminate it

4 0
3 years ago
5 numbers that create the mean of 9​
Jlenok [28]

Answer:

9,9,9,9,9

Step-by-step explanation:

Let the five unknown numbers be x

= \frac{x+x+x+x+x}{5} = 9

Simplify

\frac{5x}{5} = \frac{9}{1}

Cross-cancel common factor ; 5

5x\div 5 = x\\\\x = \frac{9}{1} \\\\x = 9

8 0
3 years ago
A fuel-tanker's tank is 50 feet long and has a diameter of seven feet. Determine the surface area of the fuel tank.
Bezzdna [24]

Answer:

1176.679ft²

Step-by-step explanation:

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Surface Area= 2×3.142×3.5×50 + 2×3.142×3.5×3.5

S.A=1099.7+76.979=1176.679ft²

6 0
3 years ago
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nikitadnepr [17]
Smith = 1.5Jones
S=1.5J
S + J = 15
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S = 9
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3 years ago
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