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2 years ago

Help me with this math plz

Mathematics

2 answers:

SVEN [57.7K]2 years ago

8 0

Answer:

B. Right

Step-by-step explanation:

40+50=90 :D

Hope this helps

8090 [49]2 years ago

4 0

Obtuse I think because 50+40+11=101

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Valentin [98]

Since calculating volume is multiplying the side lengths together we first have:

b x b x 4

Then we can simplify b x b to b ²

And when you multiply b² by 4 you get 4b²

Answer: 4b² is the volume of the fish tank.

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3 years ago

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at a concession stand 9 slices of pizza and 5 soft pretzels cost $33.25. If 4 slices of pizza and 6 soft pretzels cost $19.50. W

jok3333 [9.3K]

Answer:

The cost of soft pretzel is $1.25

Step-by-step explanation:

Let $x be the price of one slice of pizza and $y be the price of one soft pretzel.

1. 9 slices of pizza cost $9x and 5 soft pretzels cost $5y. Together they cost $33.25, then

9x+5y=33.25.

2. 4 slices of pizza cost $4x and 6 soft pretzels cost $6y. Together they cost $19.50, then

4x+6y=19.50.

3. Solve the system of two equations:

$\left\{\begin{array}{l}9x+5y=33.25\\4x+6y=19.50\end{array}\right..$

Multiplythe first equation by 4, the second equation by 9 and subtract them:

$4(9x+5y)-9(4x+6y)=4\cdot 33.25-9\cdot 19.50,\\ \\36x+20y-35x-54y=133-175.5,\\ \\-34y=-42.5,\\ \\y=\$1.25.$

Then

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3 years ago

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3 years ago

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Airida [17]

Answer:

-10/3 is the answer

Step-by-step explanation:

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Recall Demoivre theorem as

(cosA+isinA)(cos A+isin B) = cos(A+B)+isin(A+B)

Hence here we have sum of angles as

A+B = 63+117 =180

$z1z2=\frac{2}{5} \frac{10}{3} (cos180+isin180)$

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3 years ago

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a_sh-v [17]

Answer: infinite solutions

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