Answer:
Ok
Step-by-step explanation:
Answer:
(5,-1)
Step-by-step explanation:
Answer:
He have 43 bills of 10 and 13 bills of 5
Step-by-step explanation:
5x + 10y = 495
x + y = 56
Isolate x:
x = 56 - y
Substitute in the first equation:
5(56 - y) +10y = 495
280 -5y +10 y = 495
5y = 495 -280
5y = 215
y = 215/5
y= 43
Now substitute the value of y to find x:
x = 56 - y
x = 56 - 43
x = 13
-5(1 - 5x) + 5(-8x - 2) = -4x - 8
-5 + 25x - 40x - 10 = -4x - 8
25x - 40x + 4x = -8 + 10 + 5 = 7
-11x = 7
x = -7/11
Answer:
d
Step-by-step explanation:
Step-by-step explanation:
Using Pythagoras' identity on the right triangle.
The square on the hypotenuse is equal to the sum of the squares on the other 2 sides, that is
AB² = 7² + 4² = 49 + 16 = 65 ( take the square root of both sides )
AB = \sqrt{65} → D
