Answer:
15x + 9
Step-by-step explanation:
9(3x + 8) – 3(4x + 21)
Multiply
27x + 72 - 12x - 63
Combined like terms
27x - 12x = 15x 72 - 63 = 9
15x + 9
Answer:
21
Step-by-step explanation:
He will guess correctly 25% of the time.
He has 84 questions
25% of 84
.25 * 84
21
We should expect that he will get 21 questions correct
Absolute value<span> describes the distance of a </span>number<span> on the </span>number<span> line from 0 without considering which direction from zero the </span>number<span> lies. This pretty much means that absolute value is a distance, and there is no such thing as a negative distance.</span>
Answer:
±2√3
Step-by-step explanation:
Equation :
x² -4 = 8
x² -12 = 0
Using the quadratic formula then simplifying gives you :
±2√3
I know this lacks explanation but please brainliest
Answer:
4 Hours
Step-by-step explanation:
we will set up two linear equations first by taking the initial height if each candle and subtracting the rate they burn at times our input variable of time (x) equal to height (y)
So, 8-7/10x=y and 6-1/5x=y
then, because both equations equal y you can set them equal to each other so
8-7/10x=6-1/5x
Finally, solve for x
8-7/10x=6-1/5x
subtract 6 from both sides
2-7/10x=-1/5x
add 7/10 x to both sides (1/5x=2/10x)
2=5/10x
simplify
2=1/2x
x=4
