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Zina [86]
3 years ago
5

Explain when to use Mental Math

Mathematics
1 answer:
I am Lyosha [343]3 years ago
3 0
It is best to use mental math with some equations (5x5 or something that is easy enough that work does not have to be shown 10 dived by 5
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The length of a rectangle is 1 more yd than twice the width, and the area of the rectangle is 66 yd squared. Find the dimensions
Salsk061 [2.6K]

Width = 5.5yd  

Length = 12yd

<u>Explanation:</u>

Area of rectangle =  66yd^{2}

Let width of the rectangle = b ,  

So, length = 2b+1  

Area of rectangle = (length X width) - eqn 1

Putting the value of length and width in above equation 1,

66yd^{2} = (2b+1) X b\\66yd^{2} = 2b^{2} + b\\2b^{2} +b-66 = 0\\

On solving the equation we get,

b = 5.5yd

So, width (b) = 5.5yd

and length = 2(5.5) + 1

l = 12yd

Hence,  

Width = 5.5yd  

Length = 12yd

6 0
3 years ago
What is the area of the composite figure in problem 3?
suter [353]

Answer:

trapazoid

Step-by-step explanation:

5 0
3 years ago
A $1,500 loan has an annual interest rate of 4 1/2 on the amount borrowed.how much time has elapsed if the interest is now $127.
Vadim26 [7]
Probably none of them except 156. 
6 0
3 years ago
X is directly proportional to w²
umka21 [38]

The formula for x in terms of w is x = 3w² and the formula for y in terms of x is y = (1/112)x³

<h3>Variation</h3>

x = k × w²

w = 4, x = 48

48 = k × 4²

48 = k × 16

48 = 16k

k = 48/16

k = 3

So,

x = k × w²

x = 3 × w²

x = 3w²

y = k/x³

x = 2, y = 14

14 = k / 2³

14 × 2³ = k

14 × 8 = k

112 = k

So,

y = k/x³

y = 112/x³

y = (1/112)x³

Learn more about variation:

brainly.com/question/6499629

#SPJ1

3 0
1 year ago
Simplify(3 square root 3 x square root 5 square root of 3)Square root of negative two
Assoli18 [71]

Answer:

9√10 (nine square root ten)

Step-by-step explanation:

(3√3  .√5.√3.)√2

= (3√3*3.√5)√2

=(3*3.√5)√2

=(9√5) √2

=9√5*2

=9√10

8 0
3 years ago
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