Please Help, This is a mathematical question, which I'm confused on.

Mathematics

2 answers:

Goryan [66]4 years ago

4 0

T would be 72 because 2x2=4 and 4x18=72

nlexa [21]4 years ago

4 0

36 x 2^2 = 144
Since it is a square cake and we need to find the length, we would divide 144/2 and get 72. The length of the cake must be 72 inches. We can only divide it by two, because it is square and that means all sides are the same length.

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I need help with number 4

Nadusha1986 [10]

$\bf \begin{cases}
\quad3x+2y=-9\\
-10x+5y=-5
\end{cases}$

so hmm the idea behind the elimination, is to make the value atop or below, of either variable, the same but with a negative sign

so hmmm say... we'll eliminate "y"

so... let's see, we have 2y and 5y, both positive
what do we multiply 2y to get a negative -5y, that way, -5y +5y = 0 and poof it goes

well let's see, let's try "k" $\bf 2yk=-5y\implies k=-\cfrac{5y}{2y}\implies k=-\cfrac{5}{2}$

so.. if we multiply 2y by -5/2, we'll end up with -5y

well, let's multiply that first equation then by -5/2

$\bf \begin{array}{rllll}
3x+2y=-9&\qquad\times -\frac{5}{2}\implies &-\frac{15}{2}x-5y=\frac{45}{2}\\\\
-10x+5y=-5&\implies &-10x+5y=-5\\
&&---------\\
&&\frac{-35}{2}x+0\quad=\frac{35}{2}
\end{array}\\\\
-----------------------------\\\\
\cfrac{-35}{2}x=\cfrac{-35}{2}\implies \cfrac{-35x}{2}=\cfrac{-35}{2}\implies x=\cfrac{2}{-35}\cdot \cfrac{-35}{2}
\\\\\\
\boxed{x=1}$

so.. now we know x = 1.... so let's plug that in say hmmm 2nd equation

$\bf -10(1)+5y=-5\implies -10+5y=-5\implies 5y=5\implies\boxed{ y=1}$

3 0

4 years ago

each unit uses a chip 3/32 inches long how many units can be made if i have chips that are 9/16 inches long

Vikentia [17]

If you do 9/16 / 3/32 you can change that into 9/16 x 32/3 and cross multiply which gives you 512/27. And that equals 18.96 which you can round to 19. So you would be able to make 19 units if you use the 9/16 chips

8 0

3 years ago

Aunt Nelly had 6/8 cup of chocolate chips. She used 2/5 cup in the pancakes she made for breakfast. How much of the chocolate ch

Otrada [13]

There were 7/20 cup of chocolate chips left for cookies

4 0

3 years ago

Partial quotient 584/73

Lyrx [107]

Answer:

8 is the answer

4 0

3 years ago

I will give brainliest:)

lawyer [7]

Answer:

21.98 x 2 = 43.96

43.96 + 78.99 = 122.95

I hoped I helped.

7 0

3 years ago

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