Answer: -4/5, in decimal form -0.8
Step-by-step explanation: −4.1+2n+1+0.3n
Combine Like Terms:
=−4.1+2n+1+0.3n
=(2n+0.3n)+(−4.1+1)
=2.3n+−3.1
=2.3n−3.1
If we assume that
x isthe number of multiple choice questions, and y is the number of word problems, we can write a system of equations like:
{ x + y = 38
{ 2x + 5y = 100
If we multiply the first equation by -2 we get:
{ -2x-2y = -76
{ 2x + 5y = 100
Now if we add both equations we get only equation with 1 unknown (y) :
3y = 24 ⇒ y = 8
Substituting the calculated value to the first equation we get:
x + 8 = 38 ⇒ x = 30
The solution:
{ x = 30
{ y = 8
means that:
The test had 30 multiple choice questions, and 8 word problems.
To find the decreased percentage,here's what we can do:
In this case,the eqaution would be:
Hope it helps!
Answer:
n < 0
Step-by-step explanation:
A negative number is one that is less than zero.
n < 0
