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3 years ago

Help me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ._.

Mathematics

2 answers:

ra1l [238]3 years ago

8 0

There are 40 black and 20 blue so if you divide by 20 the ratio is 2:1

ehidna [41]3 years ago

6 0

The ratio is 40 to 20

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Suppose y varies directly with x. if y=-3 when x=5 find y when x=-1

Scrat [10]

$\bf \begin{array}{cccccclllll}
\textit{something}&&\textit{varies directly to}&&\textit{something else}\\ \quad \\
\textit{something}&=&{{ \textit{some value}}}&\cdot &\textit{something else}\\ \quad \\
y&=&{{ k}}&\cdot&x

&& y={{ k }}x
\end{array}
\\ \quad \\
\textit{we know that, when}
\begin{cases}
y=-3\\
x=5
\end{cases}\implies y=kx\implies (-3)=k(5)$

solve for "k", to find the "constant of variation",
then plug it back in the y = kx, to get the equation
now
what's is y when x = -1?
well, just plug that in the equation with the found "k" value,
to get "y" :)

3 0

3 years ago

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write a real world situation that can be represented by 15 + c = 17.50. Then solve the equation and describe what your answer re

Nana76 [90]

15+c=17.50 First you subtract 15 by 15 because you switch operations from adding to subtracting then you would put C under it Second subtract 17.50 and 15 and that is 2.50 so C= 2.50

3 0

2 years ago

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Solve for y. V - 14 = 14 4 Simplify your answer as much as

LUCKY_DIMON [66]

It's 0 I took a similar test as that one

5 0

2 years ago

Are these equations equivalent? 3 (x+4) = 12 and 3 (x+1) = 4

N76 [4]

Answer:

Step-by-step explanation:

You can simplify them both.

3x+12=12 and 3x + 3 =4

make them both so they equal 0

3x=0 and 3x-1=0

no, theyre not equal since when they both equal 0, they are not the same equation

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2 years ago

Find the cost price in each of the following:

Bas_tet [7]

Step-by-step explanation:

a.120÷100×20

profit=24

=24+120

=144

b.289÷100×15

=43.35

289-43.35

=245.65

8 0

2 years ago