Answer:
C should be the correct answer
Step-by-step explanation:
forgive me if im wrong
Answer:
a, b, c
(all but the last one)
Step-by-step explanation:
a+b+c=180 is true bcuz the sum of interior angles in a triangle is 180
rearrange a+b+c=180 into a+b=180-c
observe that 180-c equals d, so in the equation a+b=180-c replace 180-c with d.
a+b=d so thats true
we already established that d=180-c so thats true as well
and the last one is just not true
Answer:
r≈1.78
Step-by-step explanation:
x ≈ 2.39
x ≈ 0.28
1/27
-1
-27
Answer:
N+D _>21
Step-by-step explanation:
N= The number of nickel
D= The number of dimes
So it is n+d less than with the line under it 21
Answer:
n+d _>18
Step-by-step explanation:
Answer:
-8x² + 28x - 20
Step-by-step explanation:
To simplify the expression A(x) = ( 2x - 5 )( x + 1 ) - ( 5x - 3 )( 2x - 5 ), you can start by using the distributive propertyto expand both sets of parentheses and then combine like terms:
A ( x ) = ( 2x - 5 ) ( x + 1 ) - ( 5x - 3 ) ( 2x - 5 )
( 2x - 5 ) ( x + 1 )
2x ( x ) + 2x ( 1 ) - 5 ( x ) - 5 ( 1 )
2x² + 2x - 5x - 5
( 5x - 3 ) ( 2x - 5 )
5x ( 2x ) + 5x ( -5 ) - 3 ( 2x ) - 3 ( -5 )
10x² - 25x - 6x + 15
2x² + 2x - 5x - 5 - ( 10x² - 25x - 6x + 15)
2x² + 2x - 5x - 5 - 10x² + 25x + 6x - 15
( 2x² - 10x² ) + ( 2x - 5x + 25x + 6x ) + ( -5 - 15 )
-8x² + 28x - 20
∴ A ( x ) = -8x² + 28x - 20