Answer:
84
Step-by-step explanation:
Let the first digit = x
Let the second digit =y
x + y = 12
x + 4 = 3*y
===========
From the second equation, we learn that x = 3y - 4
Put that into the first equation.
3y - 4 + y = 12 Combine the left side
4y - 4 = 12 Add 4 to both sides
4y = 16 Divide by 4
4y/4 = 16/4
y = 4
=================
x + 4 = 12
x + 4 - 4 = 12-4
x = 8
So the number is 84
Answer:
mathematics is inclusive, so A or B is a set of things where each of them must be ... Kevin Houston in his book[2] gives an idea to think of a proof
Step-by-step explanation:
Answer:
68
Step-by-step explanation:
8 x 40 = 320
9 x 28 = 252
320 - 252 = 68
Answer:
1) Length = 5.7
2) Midpoint = (0, 2)
3) Gradient = 1
Step-by-step explanation:
We are given the intervals as;
A(-2, -1) and B(2, 3)
1) Formula for length of interval is;
AB = √[(3 - (-1))² + (2 - (-2))²)]
AB = √(16 + 16)
AB = √32
AB = 5.66 ≈ 5.7
2) Midpoint of the interval is;
((-2 + 2)/2), (-1 + 3)/2
This gives; (0, 2)
3) gradient is the slope and it's given by;
m = (y2 - y1)/(x2 - x1)
m = (3 - (-1))/(2 - (-2))
m = 4/4
m = 1
