Answer:
The correct answer is 70.
Step-by-step explanation:
Since they got the same answer we have the equation:
(a + 3)a + 6 = a + 3(a + 6)
a^2 + 3a + 6 = a + 3a + 18
a^2 + 3a - 3a -a + 6 - 18 = 0
a^2 - a - 12 = 0
(a - 4)(a + 3) = 0
So a = 4 or -3.
As a is given as positive we take a = 4.
The correct numerical value =
(4 + 3)( 4 + 6)
= 70.
Answer:
50 % alcohol solution = 10 millimetres
30 % alcohol solution = 90 millimetres
Step-by-step explanation:
two equations can be derived from this question
x + y = 100 equation 1
0.3x + 0.5y = 100 x 0.32 = 32
0.3x + 0.5y = 32 equation 2
where :
x = 30% alcohol solution
y = 50% alcohol solution
multiply equation 1 by 0.3
0.3x + 0.3y = 30 equation 3
subtract equation 3 from 2
0.2y = 2
y = 10
substitute for y in equation 1
x + 10 = 100
x = 100 - 10
x = 90
Put the graph in and I will solve this question. it is unsolvable without the graph.
3/4 is .75
There are 60 minutes in an hour
Multiply .75 by 60 to get 45 minutes
Answer:
www.imsorryineedpoints.org