5 feet is equal to 60 inches. 60 inches divided by 2.5 inches per hour means it would take 24 hours for the drill to reach five feet (assuming it maintains the same rate of digging)
Answer:
please help this person
Step-by-step explanation:
Answer:
40 years old
Step-by-step explanation:
Let's imagine a+b=63
63-12=51 (since they were both 6 years younger)
A is double B
34+17=51
34/2=17
You need to add the 6 years back onto the mothers age - 34+6=40
40 years old
(if you don't wanna read all this the answer is at the bottom btw)
move the 7 over to equate the equation to 0
4x^2 - 12x -7 = 0
(ok now you have a (4), b (-12), and c (-7) here you can either use the quadratic formula to solve it or factor the equation)
to factor it, you have to multiply a and c (4*-7 = -28) and find two numbers that multiply to -28 and add to -12
the numbers are -14 and 2. sub those into the equation in place of b
4x^2 + 2x - 14x - 7 = 0
find the lcd of the first two terms and the last two terms to factor them
2x(2x + 1) - 7(2x+1) = 0
(2x -7) (2x+1) = 0
(x-7/2)(x+1/2) = 0
to find the two x values you need to find what values make the equation equal 0 on both sides.
so x is 7/2 or -1/2
I believe (3*8)*6=3*(8*6) illustrates the associative property of multiplication.
(3*8)*6=3*(8*6)
24*6=3*48
144=144