We can usually get a couple of facts for these that let us rule out answers without working out all the details.
The green and red areas are below a CUP parabola, opening up. CUP stands for concave up positive, and tells us there's a positive coefficient on x². Unfortunately all the choices have a positive 1 coefficient, no help here.
Since the areas are below they're going to be y ≤ x² + other stuff. That rules out B and C.
The red and blue parts are below the line, and the line has a positive slope. So that's y ≤ mx + b where m>0 is the positive slope. That rules out D with the negative slope.
Answer: A
Answer:
a = d - r + c
Step-by-step explanation:
Simply switch the terms around a bit and you have the answer.
Hope this helped!
Answer: After 8 hours the pressure will be at -60?
Explanation: not sure how the balloon can reach -60 kilopascals but 15% of 300 is 45 and 45 x 8(hours) is 360. 300 - 360 is -60
Answer:
It's choice A.
Step-by-step explanation:
Kevin is 3 years older than Daniel gives:
k = d + 3.
2 years ago kevin is aged k - 2 and daniel d - 2 years.
So:
k - 2 = 4(d - 2).
