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4 years ago

How do you explain mental math to multiple two numbers

Mathematics

1 answer:

Fantom [35]4 years ago

7 0

When multiplying two numbers, a person can mentally add one of those numbers the other number amount of times.

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Write 10,000 in scientific notation

Semenov [28]

1*10^4
Or
10^4
Either way

3 0

3 years ago

(1 point) How many ways can you give 9 (identical) apples to your 5 favourite Mathematics lecturers (without any restrictions)?

cricket20 [7]

Answer:

126

Step-by-step explanation:

Total number of apples = 9

Number of favourite Mathematics lecturers = 5

To find number of ways in which 9 (identical) apples can be given to your 5 favourite Mathematics lecturers, find $C(9,5)$

Combination refer to selection of items such that order does not matter.

Use $C(n,p)=\frac{n!}{p!(n-p)!}$

Put $n=9,p=5$

$C(9,5)=\frac{9!}{5!(9-5)!}\\=\frac{9!}{5!4!}\\=\frac{9(8)(7)(6)5!}{5!4!} \\=\frac{9(8)(7)(6)}{4(3)(2)(1)}\\=126$

7 0

3 years ago

On monday an investor bought 100 shares of stock. On Tuesday the value of the shares went up 4%. how much did the investor pay f

8090 [49]

1198.08
1248 / .04 = 49.92
1248 - 49.92 = 1198.08

3 0

4 years ago

I don’t know the answer or how to do this, help!

makvit [3.9K]

Answer:

Step-by-step explanation:

y = x^2 - x - 12

y = (x-4)×(x+3) that means x it either 4 or -3

y = x + 3

for x = 4 ➡ y = 3+4 ➡7

for x = -3 ➡ y = -3 + 3➡0

(the answer key is most probably faulty there's no way for y to be 0 in both scenarios)

6 0

3 years ago

What is k(-4) equal to?<br><br> K:m => 7+m^2<br><br> K(-4) = [1]

Zarrin [17]

The function is defined as

$k:m\mapsto m^2+7$

This means that, taken an input m, the output is the input squared, plus 7.

So, if we take the input -4, we square it to get 16, and we add 7 to get 23.

3 0

4 years ago