3 years ago

6.3 is 7% of what number

1 answer:

7 0

$7\%=\frac{7}{100}=0.07\\\\x-the\ number\\\\0.07x=6.3\ \ \ \ \ |divide\ both\ sides\ by\ 0.07\\\\x=\frac{6.3}{0.07}\\\\x=\frac{630}{7}\\\\\boxed{x=90}\leftarrow answer$

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A board that is 4 1/2 feet long weighs 7 1/5 pounds. How much would one foot of the board

REY [17]

Answer:

A board that is 4 1/2 feet long weighs 7 1/5 pounds. How much would one foot of the board weigh? Write your answer as a mixed number

Step-by-step explanation:

8 0

3 years ago

Solve <br><img src="https://tex.z-dn.net/?f=%20%5Cfrac%7B4%20%7D%7B4%20-%20x%7D%20%3D%20%5Cfrac%7B5%7D%7B%284%20%2B%20x%29%7D%20

lisov135 [29]

$Domain:\\4-x\neq0\ \wedge\ 4+x\neq0\\x\neq4\ \wedge\ x\neq-4\\\\\dfrac{4}{4-x}=\dfrac{5}{4+x}\qquad\text{cross multiply}\\\\4(4+x)=5(4-x)\qquad\text{use distributive property}\\\\(4)(4)+(4)(x)=(5)(4)+(5)(-x)\\\\16+4x=20-5x\qquad\text{subtract 16 from both sides}\\\\4x=4-5x\qquad\text{add 5x to both sides}\\\\9x=4\qquad\text{divide both sides by 9}\\\\\boxed{x=\dfrac{4}{9}}$