Answer:
B.6
Step-by-step explanation:
3 + 2x + 22 = x + 17
Combine like terms
25 + 2x = x + 17
Subtract 17 from both sides
8 + 2x = x
Subtract 2x from both sides
8 = -x
Divide both sides by -1
x = -8
Substitute -8 for x in 2x + 22 to find value of QR
2(-8) + 22
Multiply
-16 + 22
Add
QR = 6
To factorise this quadratic, you need to find two numbers that add together to give -8 but also multiply to give 15. These two numbers can be identified as -3 and -5 as -3-5=-8 and -3×-5=15. Therefore, the factorised form is (x-3)(x-5). To find the solutions, write (x-3)(x-5)=0. Deal with each bracket individually:
x-3=0
x=3
x-5=0
x=5
So the two solutions are 3 and 5.
Answer:
B.
Step-by-step explanation:
The function above the x-axis looks like a parabola, so it must have an x^2 term. It also has an open circle, so it must have a > symbol.
The function below the x-axis has a closed circle, so it must have a <= symbol. It is also a 3rd degree polynomial.
Answer: B.
Answer:
Response bias
Step-by-step explanation:
Response bias means: anything in a survey that influences responses. In this situation the question is "Do you favor harsher penalties for individuals who sell guns illegally?" The person is asking a very specific question rather than allowing it to be broad. The scenario is that the surveyor wanted tot estimate the percentage of people who favor just stricter gun laws in general and not within the limits of illegally sold guns. If he were to ask "Do you favor stricter penalties for buying/selling guns?" then it would fit the guidelines of the initial estimate. hope this makes sense :)