3 years ago

How to use mental math

Mathematics

2 answers:

Lana71 [14]3 years ago

4 0

Mental maths is maths that can be done in your head without any written help

telo118 [61]3 years ago

3 0

Commonsense you do math in your mind

You might be interested in

Kiran is collecting dimes and quarters in a jar. He has collected $10.00 so far and has dimes and quarters. The relationship bet

Aleks [24]

Answer:

A, C, and E

Step-by-step explanation:

i just substituted the d and q values

8 0

3 years ago

What is BC?<br><br> ___ units

oksian1 [2.3K]

Okay. First off, let’s solve for the first two sides, since they are the same length. Set it up like this: 8x - 4 = 5x + 11. Subtract 5x from both sides to get 3x - 4 = 11. Next, add 4 to both sides to get 3x = 15. Now, divide each side by 3 to isolate the x and you get 5. Let’s plug in the values. 8 * 5 = 40 - 4 = 36. 5 * 5 = 25 + 11 = 36. There. x = 5. Now, let’s plug the 5 in to the other formula. 5 * 4 = 20. 20 - 2 = 18. There. BC is 18 units long.

7 0

4 years ago

Which statement is true about the net and the solid it can form?

Sever21 [200]

The length of side c will be 2 m.

3 0

2 years ago

Let x be a random variable with pmf pk = c/k2 for k = 1, 2, …a. estimate the value of c numerically. note that the series conver

kaheart [24]

$f_X(x)=\begin{cases}\dfrac c{k^2}&\text{for }k\in\{1,2,\ldots\}\\0&\text{otherwise}\end{cases}$

Because this is a valid PMF, you must have

$\displaystyle\sum_{k\ge1}f_X(x)=\sum_{k\ge1}\frac c{k^2}=1$

Recall that

$\displaystyle\sum_{k\ge1}\frac1{k^2}=\dfrac{\pi^2}6$

so the above sum is

$\displaystyle\sum_{k\ge1}\frac c{k^2}=\frac{c\pi^2}6=1$

which means that you must have

$c=\dfrac6{\pi^2}\approx0.6079$

8 0

3 years ago

Convert 9354grams to kilograms

STatiana [176]

Answer:

9.354kg

Step-by-step explanation:

7 0

3 years ago