The best and most correct answer among the choices provided by the first question is the first choice or letter A.
The expression above is an example of a numerical expression.
I hope my answer has come to your help. God bless and have a nice day ahead!
Answer:
78 is the answer
Step-by-step explanation:
because 1 =1
Solving this problem is just pretty straight forward. All
we have to do is to use the concept of ratio and proportion.
First, let us say that the change in elevation in half an
hour (30 minutes) takes the value of variable x.
From the given, we know that the ratio of height and time
is:
152 m : 8 minutes
And the next ratio is:
x : 30 minutes
To solve for the value of x, we equate the two:
152 m : 8 minutes = x : 30 minutes
We know that the symbol of ratio which is “:” also means
division, therefore:
152 m / 8 minutes = x / 30 minutes
x = 152 m * 30 minutes / 8 minutes
x = 570 m
Therefore the change in elevation after half an hour is
570 meters.
7y-3=5y+3
2y=6
y=3
so the length of XY = 7*3-3 =18
4x - 3y = 18 (1)
8x - 6y = 34 (2)
Divide equation b by 2
4x - 3y = 17
So now you have
4x - 3y = 18
4x - 3y = 17
--------------------subtract
0 - 0 = 1
0 ≠ 1
No solution
Answer is the last option
4x - 3y = 18
8x - 6y = 34
------------------------------
3x + 6y = 22 (1)
6x + 12y = 44 (2)
Divide equation 2 by 2
3x + 6y = 22 -------------same as equation 1
Subtract equation 2 from 1
0 = 0
Infinitely many solutions
Answer is the second option
3x + 6y = 22
6x + 12y = 44
