a rectangle has a width of 6 units and a length of 2x + 8 units of the area is 108 units squared what is the value of x

2 answers:

5 0

Im assuming that the 36 square units is the constant area. if so the product of the length times the width is constant note that

each side could be 9 units and the other 4 units.

but L/W = 6/6 isn't proportional to L/W = 4/9

zimovet [89]3 years ago

4 0

4 is the valew of x
i think

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A chemistry teacher needs to mix a 20% salt solution with an 80% salt solution to make 20 qt of a 40% salt solution. How many qu

Svetlanka [38]

Answer:

6 2/3 qt 80%
13 1/3 qt 20%

Step-by-step explanation:

It is often convenient to solve a mixture problem by letting a variable represent the quantity of the higher-concentration contributor to the mix.

We can let x represent the number of quarts of 80% solution needed. Then (20-x) is the number of quarts of 20% solution needed. The amount of salt in the final mix is ...

0.80x +0.20(20-x) = 0.40(20)

0.60x = 0.20(20) . . . . . . . . subtract 0.20(20) and simplify

x = 20/3 = 6 2/3 . . . . . . . . . divide by 0.60; quarts of 80% solution

(20 -x) = 13 1/3 . . . . . . . . . . amount of 20% solution needed

The teacher should mix 6 2/3 quarts of 80% solution with 13 1/3 quarts of 20% solution.

3 0

2 years ago

Answers: A. 2 B. 2/3 C. 1/2 D. 1/4

laila [671]

Answer:

A. 2

Step-by-step explanation: