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svetlana [45]
3 years ago
14

What is 3/10x9 please help me

Mathematics
2 answers:
Monica [59]3 years ago
6 0
27/10 is the answer
lora16 [44]3 years ago
5 0
(3/10)×9

=27/10=2.7  
>>>>>>>>>>>>>
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I will mark brainliest
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2 1/2   (2.5)

Step-by-step explanation:

Multiply all the numbers then divide by 1/2

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2 years ago
Write an exponential function to represent a situation in which the initial value is 175 and the rate of decay is 20%
AleksAgata [21]

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3 years ago
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7 0
2 years ago
Given x^2 + y^2 = 36 and xy = -10 find x + y.
9966 [12]
This looks fun

ok so
we will use subsitution
xy=-10
divide both sides by x or y (I will choose y)
x=-10/y

sub -10/y fo x

(-10/y)^2+y^2=36
100/(y^2)+y^2=36
times both sides by y^2
100+y^4=36y^2
minus 36y^2 from both sides
y^4-36y^2+100=0
(y^2)^2-36(y^2)+100=0
quadratic formula
for
ax^2+bx+c=0
x=\frac{-b+/- \sqrt{b^2-4ac} }{2a}
x=\frac{-(-36)+/- \sqrt{(-36)^2-4(1)(100)} }{2(1)}
x=18+/- 4\sqrt{14}

sub
y=-10/x
y=\frac{-10}{18+/- 4\sqrt{14}}

so x+y=18+/- 4\sqrt{14}+\frac{-10}{18+/- 4\sqrt{14}}
multiply first number by \frac{18+/- 4\sqrt{14}}{18+/- 4\sqrt{14}} and add them

x+y=\frac{(18+/- 4\sqrt{14})(18+/- 4\sqrt{14})-10}{18+/- 4\sqrt{14}}
or
x+y=\frac{81+22 \sqrt{14} }{5} or \frac{81-22 \sqrt{14} }{5}




8 0
3 years ago
5x+3=23<br>what is the answer?​
Margaret [11]

Answer:

4

Step-by-step explanation:

Sub both sides by 3 then describe 20 by 5.

5 0
3 years ago
Read 2 more answers
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