3 years ago

I need help pls its due in 40 minutes

Mathematics

1 answer:

mina [271]3 years ago

4 0

Answer:

I am attaching photo hold on

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What is the name for the distance between the crest and trough of wave?

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Answer:

wave height

Step-by-step explanation:

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3 years ago

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Solve the simultaneous equations. You must show all your working to find x and y. 1/2x -3y = 9 5x y + y = 28

Anastaziya [24]

The right question is:

$\frac{1}{2}x - 3y = 9$

$5x + y = 28$

Answer:

$x = 6$

$y = -2$

Step-by-step explanation:

Given

$\frac{1}{2}x - 3y = 9$

$5x + y = 28$

Required

Solve for x and y

Make y the subject of formula in the second equation

$y = 28 - 5x$

Substitute $y = 28 - 5x$ in the first equation

$\frac{1}{2}x - 3(28 - 5x) = 9$

Open the bracket

$\frac{1}{2}x - 3*28 - 3*- 5x = 9$

$\frac{1}{2}x - 84 + 15x = 9$

Collect Like Terms

$\frac{1}{2}x + 15x = 9+ 84$

$\frac{x}{2} + 15x = 9+ 84$

$\frac{x+30x}{2} = 93$

$\frac{31x}{2} = 93$

Multiply both sides by 2

$2 * \frac{31x}{2} = 93 * 2$

$31x = 186$

Divide both sides by 31

$\frac{31x}{31} = \frac{186}{31}$

$x = \frac{186}{31}$

$x = 6$

Recall that $y = 28 - 5x$

So;

$y = 28 - 5 * 6$

$y = 28 - 30$

$y = -2$

Hence;

$x = 6$ and $y = -2$

8 0

3 years ago

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Janine wishes to conduct a poll to predict how many students will vote for her for class president. Which polling methods are li

vredina [299]

D since she is asking her friends who are just going to ask their friends
A. since only 5 are asked

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3 years ago

A square has a perimeter of 12x + 52 units . Which expression represents the side length of the square in units?

Lapatulllka [165]

Answer:

3x+13

Step-by-step explanation:

Perimeter of square = 4 * length

Length = Perimeter/4

Length = (12x + 52)/4

Length = 3x+13

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3 years ago

Please help me with this :/ I will give Brainiest! I just really need help. Please

ollegr [7]

Did you ever get the answer to this?

8 0

3 years ago