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S_A_V [24]
3 years ago
12

Find 51* 49 USING MENTAL MATH'

Mathematics
2 answers:
Nesterboy [21]3 years ago
7 0
I used mental math and it took a long time, but I got the answer of 2,499.
goldfiish [28.3K]3 years ago
7 0

Answer:

The value of given expression is 2499.

Step-by-step explanation:

The given expression is

51\cdot 49

This expression can be written as

(50+1)\cdot (50-1)

Using the property of algebraic expression we get

(50+1)\cdot (50-1)=(50)^2-1^2          [\because (a-b)(a+b)=a^2-b^2]

(50+1)\cdot (50-1)=2500-1

(50+1)\cdot (50-1)=2499

Therefore the value of given expression is 2499.

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Lorico [155]

Given:

The objective is to find the slope of the straight line.

Explanation:

The general equation to find the slope is,

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Let's consider two coordinates from the graph.

\begin{gathered} (x_1,y_1)=(0,0) \\ (x_2,y_2)=(-1,5) \end{gathered}

On plugging the values in the equation of slope,

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3 0
1 year ago
Evaluate 5 remainder 5
ExtremeBDS [4]

The remainder is 5. To calculate this, first, divide 599 by 9 to get the largest multiple of 9 before 599. 5/9 < 1, so carry the 5 to the tens, 59/9 = 6 r 5, so carry the 5 to the digits. 59/9 = 6 r 5 again, so the largest multiple is 66. Multiply 66 by 9 to get 594, and subtract this from 599 to get 5, the remainder.

8 0
8 months ago
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A store charges 6% VAT on all sales.<br>What is the total cost of a shirt marked at $30​
AURORKA [14]

Answer:

$31.8

Step-by-step explanation:

Assuming the 6% tax is separate from the $30, we can use this equation:

Total = Cost + Tax  (pretty self explanatory)

Method 1

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Total = $30 + $1.8

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Method 2

Total = $30 * 1.06          (The 1 is the original cost, the .06 is the 6% tax)

Total = $31.8

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