Step-by-step explanation:
length = (2x + 3) units
width = (x - 7) units
Area = 2( length × width)
Area = 2( (2x + 3) × (x - 7) )
Area = 2( 2x² - 14x + 3x - 21)
Area = 2 ( 2x² -11x - 21)
Area = 4x² - 22x - 42
Answer:
90% confidence interval: (70.41,86.89)
Step-by-step explanation:
We are given the following in the question:
Point estimate = 78.65
Margin of error, E = 8.24
Confidence level = 90%
Significance level = 10%
Formula:
Putting the values, we get,
(70.41,86.89) is the required 90% confidence interval.
Answer:
-5x^2 + 8 - 4x
Step-by-step explanation:
emove parentheses.
-2{x}^{2}+3-3{x}^{2}-4x+5
−2x
2
+3−3x
2
−4x+5
2 Collect like terms.
(-2{x}^{2}-3{x}^{2})+(3+5)-4x
(−2x
2
−3x
2
)+(3+5)−4x
3 Simplify.
-5{x}^{2}+8-4x
−5x
2
+8−4x
Answer:
so you would rewrite them as (2x-5)(3x-4)
then multiply 2x×3x=6x^2 then -5×-4=20
so the expression is C. 6x^2+20
