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3 years ago

Solving proportions-what’s 3 over 7 and 12 over 21? do the ratios from a proportion

Mathematics

1 answer:

Andrew [12]3 years ago

6 0

Answer:

3:7 and 12:21

6:14

9:21

12:28

No they do not for a proportion

Step-by-step explanation:

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Kaitlyn is sharpening a pencil that is 19 cm. Each time she sharpens it goes down 2.5 cm. If she sharpens her pencil 4 times. Ho

Natasha2012 [34]

Answer:

9 cm

Step-by-step explanation:

2.5x4=10

7 0

3 years ago

How do you solve it?

MatroZZZ [7]

Answer:

i: x=-2, x=1

ii: x=-1/2

Step-by-step explanation:

Quadratic form:

You solve i by using FOIL (First, Outside, Inside, Last) because it is a multiplication problem.

$(x+2)(x-1)=0$

"first" would be $x*x$ , which would equal $x^{2}$

"outside" would be $x*-1$ , which would equal $-1x, or -x$

"inside" would be $2*x$ , which would equal $2x$

"last" would be $2*-1$ , which would equal $-2$

Now you need to combine the terms so that they are one after the other

$x^{2}-x$ $+2x-2$

Combine like terms, and you should get:

$x^{2} +x-2$

i Solution

You need to get the variable by itself.

Subtract two from both sides

$x+2=0\\x=-2$

Add one to both sides.

$x-1=0\\x=1$

ii Solution

Add all the terms.

$x+2+x-1=0\\2x+1=0\\2x=-1\\x=-\frac{1}{2}$

8 0

3 years ago

What property is shown?

svetoff [14.1K]

Zero Property of Multiplication hope this helps

3 0

3 years ago

Rover has dug 4 holes and put b bones in each hole. He finds 5 more bones. How many bones does Rover have?

raketka [301]

Peyegehjduehebe siege d Irene did defunds djd Duffy dude did did rbrhr ensue he eyebrows rbdudbe dueusudvd disused shdnfbdjd when’d d didn’t shed fdjjdd s

6 0

3 years ago

Read 2 more answers

Make b the subject of this equation A = 1/2 x b x h

aalyn [17]

The equation is $b=\frac{2A}{h}$

Step-by-step explanation:

Let us revise how to make a variable subject of an equation

Write the equation and circle the variable you want to make it subject
Keep it in one side and move all other in the other side
Make the coefficient of the subject 1

∵ A = $\frac{1}{2}$ × b × h

∵ b is the subject

∴ Multiply the two sides by 2

∴ 2A = b × h

- Divide both sides by h

∴ $\frac{2A}{h}= b$

- Switch the two sides

∴ $b=\frac{2A}{h}$

The equation is $b=\frac{2A}{h}$

Learn more:

You can learn more about the equations in brainly.com/question/10708697

#LearnwithBrainly

8 0

3 years ago