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lidiya [134]
3 years ago
13

A student simplifies (6b + 4r) – (2b + r) and says that the result is 4b + 5r. Explain the error and describe the correct steps

to simplify the expression.
Mathematics
2 answers:
Nezavi [6.7K]3 years ago
7 0
Actually, its not 4b + 5r  its 4b +3r because look 

step 1. 6b + 4r - (2b + r)
step 2. 6b + 4r - 2b - r
step 3. (6b - 26) + (4r - r)
step 4. 4b + 3r  
So the answer is actually 4b + 3r 

hope i helped if did plz mark as <span>Brainliest</span>
luda_lava [24]3 years ago
6 0
The student did not distribute the negative when subtracting. Distributing the negative, the expression is equal to 6b + 4r – 2b – r. Then use the commutative property to rewrite it as 6b – 2b + 4r – r. Then you can use the distributive property to write as (6 – 2)b + (4 – 1)r, which simplifies to 4b + 3r<span>.</span>
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At a candy store, Erika bought 3 kilograms of cinnamon red hots and 1 kilogram of gummy bears for $21.00. Meanwhile, Irene bough
ch4aika [34]
31. At the candy store: => Ericka bought 3 kilograms of Cinnamon red hots and 1 kilograms of gummy bears for 21.00 dollars. => Irene bought 3 kilograms of cinnamon red hots and 3 kilograms of gummy bears for 39.00 dollars. Question: Find the costs of each kilograms. Notice that the cinnamon red hot that they both are the same, the only difference is the gummy bears, which added 2kilos for Irene. Now, let’s subtract => 39 – 21 = 18 dollars – this is the costs of 2 kilos of gummy bear => 18 / 2 = 9 dollars, thus the price of each kilos of gummy bear is 9 dollars, Now, let’s solve for the cinnamon => 21 – 9 = 12 dollars, to be divided with 3 kilos => 12 / 3 = 4 dollars – the price of cinnamon red hot per kilo.
5 0
3 years ago
The perimeter of the rectangle below is 65 inches.
dimaraw [331]
A :-) Given -
perimeter = 65 inches
Side ‘a’ = 2x
Side ‘b’ = 3 1 by 4x + 1
Solution -
Perimeter = 65
= a + b = 65
= 2x + 3 1 by 4x + 1 = 65
( 3 1 by 4 = 4 x 3 + 1 = 12 + 1 by 4
= 13 by 4 )
= 2x + 13 by 4x + 1 = 65
= 2x + 13 by 4x = 65 - 1
= 2x + 13 by 4x = 64
= 15 by 4 x = 64
= x = 64 x 4 by 15
= x = 256 by 15
= x = 17.06

.:. The value of x = 17.06.
5 0
3 years ago
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