Answer:
A. x=0
Step-by-step explanation:
x+20+10x=20+9x
cancel equal terms
x+10x+9x
add x to 10x
11x=9x
move variable to left
11x-9x=0
subtract 11x to 9x
2x=0
divide Both sides by 2
x=0
Answer: 16 seconds
To decrease it by 20% percent,
We need to first find amount by:
=20*100/20
=4
Therefore 20% of 20 second is 4 seconds
Now let’s decrease it:
20-4
16
Therefore we get 16 second by decreasing 20% of 20 seconds
EDIT:
Order of operations doesn't matter in addition. So you can add them in any order.
Answer:
d
Step-by-step explanation:
Answer:
<h2><u>B.</u></h2>
2 - 7 + 8x -3
Step-by-step explanation:
To multiply a binomial (2 terms) by a trinomial (3 terms):
Multiply the first term of the binomial by the each term of the trinomial.
Multiply the second term of the binomial by each term of the trinomial.
Combine the expressions and simplify.
(2x-3)*(-2x+1)
(2x * ) + (2x * -2x) + (2x * 1)
(2) + (-4) + (2x)
(2x-3) * (-2x+1)
(-3 * ) + (-3 * -2x) + (-3 * 1)
(-3) + (6x) + (-3)
[2 + -4 + 2x] + [-3 + 6x + -3]
2 - 7 + 8x -3
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