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dalvyx [7]
3 years ago
12

Solve for x. I really need help!

Mathematics
1 answer:
DanielleElmas [232]3 years ago
7 0

Answer:

9

Step-by-step explanation:

Please give me brainliest.

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Find the original price, discount, sale price, or selling price. Original price: $130 Markup: 35% Selling price: _____
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Step-by-step explanation:

Original price : $130

Discount : 35% × $130

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sale price : $130 - $45.50

= $84.50

4 0
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225 grams of flour are needed to make 9 cakes.
Brut [27]
So basically, 9 cakes need 225 grams of flour
Therefore 1 cake needs: \frac{225}{9} = 25 grams of flour

Moreover, 20 cakes need: 20 × 25 = 500 grams of flour

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4 0
3 years ago
Solve for x 4/x + 4/x^2-9= 3/x-3
Goshia [24]

\dfrac{4}{x}+\dfrac{4}{x^2-9}=\dfrac{3}{x-3}\qquad\text{subtract}\ \dfrac{4}{x^2-9}\ \text{from both sides}\\\\\dfrac{4}{x}=\dfrac{3}{x-3}-\dfrac{4}{x^2-9}\qquad\text{use}\ a^2-b^2=(a-b)(a+b)\\\\\dfrac{4}{x}=\dfrac{3}{x-3}-\dfrac{4}{x^2-3^2}\\\\\dfrac{4}{x}=\dfrac{3}{x-3}-\dfrac{4}{(x-3)(x+3)}\\\\\dfrac{4}{x}=\dfrac{3(x+3)}{(x-3)(x+3)}-\dfrac{4}{(x-3)(x+3)}\qquad\text{use distributive property}\\\\\dfrac{4}{x}=\dfrac{3x+9-4}{(x-3)(x+3)}\\\\\dfrac{4}{x}=\dfrac{3x+5}{x^2-9}\qquad\text{cross multiply}

4(x^2-9)=x(3x+5)\qquad\text{use distributive property}\\\\4x^2-36=3x^2+5x\qquad\text{subtract}\ 3x^2\ \text{and}\ 5x\ \text{from both sides}\\\\x^2-5x-36=0\\\\x^2-9x+4x-36=0\\\\x(x-9)+4(x-9)=0\\\\(x-9)(x+4)=0\iff x-9=0\ \vee\ x+4=0\\\\\boxed{x=9\ \vee\ x=-4}

8 0
4 years ago
PLEASE HELP ME SOLVE THIS ASAP WITH WORK!!
Vlad [161]

Answer:

6

Step-by-step explanation:

  1. If you multiply a number from the big polygon by 2/3s, you will get the corresponding number on the small polygon. For example, 6 × 2/3 = 4
  2. To find x, find the corresponding number on the big polygon and multiply it by 2/3s. The number on the big polygon is 9. 9 × 2/3 = 6

I hope this helps!

5 0
3 years ago
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