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3 years ago

Does anyone have a brief explanation on how to solve proportions?

Mathematics

2 answers:

denpristay [2]3 years ago

4 0

1) cross-multiplication: $\frac{x}{y} = \frac{a}{b}$ -> xb = ay

2) common denominator: x/y = a/b -> xb/yb = ya/yb

Cross multiplication is the easiest.

agasfer [191]3 years ago

3 0

Answer:

cross mulitply and then divide

Step-by-step explanation:

In your proportion you will have 3 of the 4 numbers such as 3/7=9/x. Mulitply the nubers that are diagonal (cross) from each other. Here it is the 7 and 9 so 7x9 = 63. Then you will divide that answer by the number that you haven't used yet, here that is the 3. So 63/3=21. x=21. Works all the time.

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Complete the table for the given rule. Rule: y=3x<br> x y <br> ? 15<br> 10 ?<br> ? 45

miskamm [114]

Answer:

x = 5, 15 y = 30

Step-by-step explanation:

y=3x is the rule, thus you can use it to find all values.

15 = 3x Divide 15 by 3 in order to isolate the variable

5 = x

y = 3(10) Multiply 3 by 10 in order to find y

y = 30

45 = 3x Divide 45 by 3 in order to isolate the variable

15 = x

4 0

3 years ago

Can you form an equation I can use to figure out how many 600 dollar checks it would take me to pay for a 13,100 bill and how lo

kari74 [83]

Answer:

${x = < \sqrt{ \geqslant \frac{6x03 \geqslant 660}{?} } }^{2}$

7 0

3 years ago

1 +5x2 + (1 + 3) to the second power

GarryVolchara [31]

Answer:

Step-by-step explanation:

1 + (5)(2) + (1 + 3)^2

1 + 10 + (1 + 3)^2

11 + (1+3)^2

11+4^2

11+16

<h3><u>Hope this helps! Have an amazing day!</u></h3>

4 0

2 years ago

Help, I need the bottom three answered and I'm sorta stuck on four too. Not sure if it's right

amm1812

5. 15 yards = 13.716 meters, so 13.716 meters
6. 32.366 meters per second
7. 32÷2=16 and 16×60= 960, so it can eat 16 in one minute, and 960 in one hour.
Hope this helps!

7 0

3 years ago

WILL MEDAL help me if please

nordsb [41]

1. Use the FOIL method (x+9)(x+9)
First, outer, inner, last
$x^{2} +9x+9x+81$
Add your like terms
$x^{2} +18x+81$

2. When you add or subtract polynomials you add or subtract the like terms and then put them in order from largest to smallest exponents.

3. $-5x(5 x^{3} +10 x^{2} -6x+3)$

4. Since it is the perimeter, we add the 3 together.
$(2 x^{2} +4x-3)+(-3 x^{2} -3)+(5x+19)$
Add the like terms together:
$2 x^{2} +(-3 x^{2} )=- x^{2} \\ 4x+5x=9x \\ -8+(-3)+19=8$
Put them in order of exponents
$- x^{2} +9x+8$

Hope this helps

8 0

3 years ago