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galben [10]
3 years ago
6

Find 51* 49 USING MENTAL MATH'

Mathematics
2 answers:
KATRIN_1 [288]3 years ago
5 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.

nikitadnepr [17]3 years ago
4 0
I used mental math and it took a long time, but I got the answer of 2,499.
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That equation just equals ln(e^(-4/3)) which can be simplified to -4/3 because ln and e cancel each other out only leaving the power
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4 years ago
Sandra bought a tube of toothpaste for $1.89, shampoo for $3.19 and a jar of peanuts for $2.29 from the local supermarket. Using
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To find the total cost, you need to add these numbers together

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4 years ago
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Salsk061 [2.6K]
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3 years ago
A light flashes every 1 minute 15 seconds. another flashes every 1 minute 40 seconds. suppose they flash together at certain tim
ASHA 777 [7]

Answer:

5 minutes

Step-by-step explanation:

To get the response to this question, it would be required to convert both times to seconds alone.

For the first, the time It takes to flash is 1 minute 15 seconds which is same as 75 seconds

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4 years ago
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-1/2(x-6)-1/4(x-4)=x-7
pentagon [3]
 -1/2(x-6)-1/4(x-4)-(x-7)= ?

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1 ÷ 4 = 0.25

Simplify 1/2
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The lowest common denominator of this problem is 4

16 - 3(x) / 4 - ( x - 7)

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We have have one solution in this problem

So, therefore x = 44/7
8 0
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