What percent are left hand dominant?

Mathematics

1 answer:

Black_prince [1.1K]2 years ago

8 0

15% are left handed

Total: 231
Total left handed: 35

35/231 = 0.151515151515152

0.151515151515152 X 100 = 15

Final answer = 15%

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Two trains, train a and train b, weigh a total 197. Train A is heavier than train b. The difference of their weights is 77 tons.

Bingel [31]

Answer:

The train A weighs 137 tons and train B weighs 60 tons.

Step-by-step explanation:

We are given the following in the question:

There are two trains.

Train A and Train B.

Let x tons be the weight of train A and y tons be the weight of train B.

Total weight = 197 tons.

Thus, we can write the equation:

$x + y = 197$

Train A is heavier than train B.

The difference of their weights is 77 tons.

Thus, we can write the equation:

$x-y=77$

Solving the two equations, we get,

$2x = 274\\\Rightarrow x = 137\\\Rightarrow y = 197-137 = 60$

Thus, the train A weighs 137 tons and train B weighs 60 tons.

5 0

3 years ago

When (81x^2/7) (2/9x^3/7) is simplified, it can be written in the form ax^b where a and b are real numbers. Find ab.

larisa86 [58]

Answer:

In improper form your solution will be $\frac{90}{7}$ . As a mixed fraction it will be $12\frac{6}{7}$ .

Step-by-step explanation:

The first thing we want to do here is to simplify this expression. After doing so, " a " and " b " should be multiplied to result in a possible improper fraction,

$\left(81x^{\frac{2}{7}}\right)\:\left(2/9x^{\frac{3}{7}}\right)\:$ - Apply exponential rule " $\:a^b\cdot \:a^c=a^{b+c}$ "

= $81\cdot \frac{2}{9}x^{\frac{2}{7}+\frac{3}{7}}$ - Combine fractions $\frac{2}{7}$ and $\frac{3}{7}$

= $81\cdot \frac{2}{9}x^{\frac{5}{7}}$ - Multiply the fractions, and simplify further

= $\frac{162x^{\frac{5}{7}}}{9}$ = $18x^{\frac{5}{7}}$ - This is out simplified expression

Now that we have this simplified expression, we can see that a = $18$ , and b = $\frac{5}{7}$ . Therefore, multiplying the two we should receive the improper fraction as follows,