Answer:
A, B
Step-by-step explanation:
After being simplified and put in standard form, the equations are ...
A. 3x² +8x -13 = 0 . . . a quadratic
B. 3x² -x -30 = 0 . . . . a quadratic
C. 4x = -16 . . . . . . . . . a linear equation, not quadratic
D. 3x⁴ -5x -6 = 0 . . . . a quartic equation, not quadratic
Both of the quadratic equations can be solved using the quadratic formula.
Answer:
The formula for the area of a square with sides of length x is A = x2 so
x2 = 400 is the equation
This equation has 2 solutions, namely x = ±√400 = +20 or -20
The negative solution does not make sense because a length cannot be less than 0.
The total length needed to go around the painting is the perimeter of the square, which is
P = 4*x = 4*20 = 80 inches
Answer:
80%
Step-by-step explanation:
Percentage = No. of days he went to school / Total no. of days the school was there * 100
Therefore, it is equal to 16/20 *100
= 16*5
= 80%
<span>Solving for y
</span>
y - 5 = 3(x - 1)<span>
Add 5 to both sides
</span>y - 5 + 5 = 3x - 3 + 5
y = 3x + 2
Your answer: y = 3x + 2<span>
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