Answer:
"The Quadratic Equation, Formula, & Discriminant. If ax² + bx + c = 0 then x = . The first equation is called the general form of a quadratic equation. The second equation is called the Quadratic Formula because it states the solution -- provides a formula for computing the simplified answer(s) by using the values of the first equation."
It is -10 because the symbols r not the same so it is negative
Correct answer is option C.(-3,-5) and (3,7)
<u>Step-by-step explanation:</u>
Let us take the value of y from equation y=2x+1 and plugin to the equation y=x2+2x-8
so
2x+1=x2+2x-8
taking constants on left hand side and literals on the right hand side
1+8=x2+2x-2x
9=x2
this implies that value of x=+3,-3
now plug in the value of x in the equation y=2x+1
when x=+3
y=2*3+1 = 7
so (3,7)
when x=-3
y=2*(-3)+1 = -5
so (3,-5)
hence the answer is (-3,-5) and (3,7)
Answer:
As both the mean and standard deviation are in the desired ranges, the tool passes the technical control.
Step-by-step explanation:
Mean of the batch:
The mean of the batch is the sum of all values divided by the number of items. So
Mean in the desired interval.
Standard deviation:
Square root of the sum of the difference squared between each term and the mean, divided by the number of items. So
As both the mean and standard deviation are in the desired ranges, the tool passes the technical control.
Answer:
Step-by-step explanation:
Face perimeter is
7.5 + 4(1.5) + 3(2.5) = 21 ft
Perimeter wall area
21(1.5) = 31.5 ft²
Face area (x2 for front and back)
2(7.5(1.5) + 2.5(1.5)) = 30 ft²
Total surface area
31.5 + 30 = 61.5 ft²