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Volgvan
4 years ago
9

When to use mental math?

Mathematics
2 answers:
Korolek [52]4 years ago
8 0
You can use mental math, when trying to break down big numbers, adding or subtracting numbers, or multiplying and dividing numbers

Hope this helped!!!
Leto [7]4 years ago
5 0
Simple. you use mental math when it's necessary.
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–0.4(3x – 2) + StartFraction 2 x plus 4 Over 3 EndFraction for x = 4
Nadusha1986 [10]

Answer:

0

Step-by-step explanation:

Given

- 0.4(3x - 2) + \frac{2x+4}{3} ← substitute x = 4 into the expression

= - 0.4(3(4) - 2) + \frac{2(4)+4}{3}

= - 0.4(12 - 2) + \frac{8+4}{3}

= - 0.4(10) + \frac{12}{3}

= - 4 + 4 = 0

4 0
3 years ago
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In cashing a check for $220, Christina asked for the whole amount in $10 and $20 bills. She received a total of 13 bills, four o
yKpoI14uk [10]

Hi

if she recieived 13 bills and 4 are 10 $? then we have 13-4= 9 20$ bills

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5 0
3 years ago
The altitude of an equilateral triangle is 15. What is the length of each side?
Bogdan [553]
An equilateral triangle is a triangle where all sides are of equal lengths. So, the angles are of equal values as well which is 60. We use the angle and the height of the triangle to determine the side length. We do as follows:

tan (60) = 15 / base/2
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6 0
3 years ago
Find the x and y intercept of y = -2x + 7
vova2212 [387]
To find the x-intercept, make y equal to 0. Then you get (7/2,0)

To find the y-intercept, make x equal to 0. Then you get (0,7)



8 0
3 years ago
The perimeter of the figure below is 133.1 ft. Find the length of the missing side.
Fantom [35]

Answer:

9.6 ft

Step-by-step explanation:

133.1 - (9.7 + 8.9 + 8.9 + 8.9 + 18.6 + 11.6 + 20.5 + 27.5 + 8.9)

133.1 - 123.5

= 9.6

3 0
3 years ago
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