Answer:
84
Step-by-step explanation:
4 test grades with an average of 80 would have a total of 80x4=320.
75+83+78=236
320-236=84
Answer:
(2, - 3)
Step-by-step explanation:
given the 2 equations
5x + 3y = 1 → (1)
7x + 3y = 5 → (2)
multiply all terms in (1) by - 1
- 5x - 3y = - 1 → (3)
add (2) and (3) term by term to eliminate the term in y
(7x - 5x) + (3y - 3y) = (5 - 1)
2x = 4 ( divide both sides by 2 )
x = 2
Substitute x = 2 in either (1) or (2) for corresponding value of y
(2) : 14 + 3y = 5 ( subtract 14 from both sides )
3y = - 9 ( divide both sides by 3 )
y = - 3
solution is (2, - 3)
The percent error is by 12%
<span>The percent error is calculated by subracting the actual weight from the estimated weight and then dividing it by the actual value and multiplying it by 100% in absolute value(Which means to remove any negative sign) </span>
Answer:
3
Step-by-step explanation:
The x value is the same for both. So it's easy. Distance between -1 and -4 is 3
Answer:
(3x - 1)(x + 1)
Step-by-step explanation:
3x^2 factors into 3x and x.
-1 factors into -1 and 1.
Now we try different positions of 3x, x, -1, and 1 until we find the correct factorization.
Try: (3x - 1)(x + 1)
When you multiply the two factors together, the middle term will be 3x - x = 2x
Since 2x is the original middle term, this is the correct factorization.
Answer: (3x - 1)(x + 1)
