[Calc] \(y = x^3 + 6 x^2 + 7 x - 2 \cos x\) changes concavity at \(x =\)
A
\(-1.58\)
✕
B
\(-1.63\)
✕
C
\(-1.67\)
✕
D
\(-1.89\)
✕
E
\(-2.33\)
✕
Question 24 of 34
| MCQ
· Level 3
[Calc] \(\operatorname*{lim}\limits_{h\rightarrow 0}(f(2+h)-f(2))/h = 5\). Which must be true? I. \(f\) continuous at 2 II. \(f\) differentiable at 2 III. \(f'\) continuous at 2
A
I only
✕
B
II only
✕
C
I and II only
✕
D
I and III only
✕
E
II and III only
✕
Question 25 of 34
| MCQ
· Level 3
[Calc] \(f(x) = 2 e^{4 x^2}\). \(f'(x) = 3\) at?
A
\(0.168\)
✕
B
\(0.276\)
✕
C
\(0.318\)
✕
D
\(0.342\)
✕
E
\(0.551\)
✕
Question 26 of 34
| MCQ
· Level 3
[Calc] Train moving 60 m/s east. Observer 70 m south. After 4 sec, train moves at how many m/s away?
A
\(57.60\)
✕
B
\(57.88\)
✕
C
\(59.20\)
✕
D
\(60.00\)
✕
E
\(67.40\)
✕
Question 27 of 34
| MCQ
· Level 2
[Calc] \(y = 2 x - 8\), min of \(xy\)
A
\(-16\)
✕
B
\(-8\)
✕
C
\(-4\)
✕
D
\(0\)
✕
E
\(2\)
✕
Question 28 of 34
| MCQ
· Level 3
[Calc] Area in Q1 enclosed by \(y = \cos x\), \(y = x\), y-axis
A
\(0.127\)
✕
B
\(0.385\)
✕
C
\(0.400\)
✕
D
\(0.600\)
✕
E
\(0.947\)
✕
Question 29 of 34
| MCQ
· Level 3
[Calc] Base of solid: \(y = \sqrt{\ln x}\), \(x = e\), x-axis. Square cross-sections perp to x-axis. Volume?
A
\(\dfrac{1}{2}\)
✕
B
\(\dfrac{2}{3}\)
✕
C
\(1\)
✕
D
\(2\)
✕
E
\(\left(\dfrac{1}{3}\right)(e^3 - 1)\)
✕
Question 30 of 34
| MCQ
· Level 3
[Calc] \(f'(x) = e^x - 3 x^2\). \(f\) has rel max at?
A
\(-0.46\)
✕
B
\(0.20\)
✕
C
\(0.91\)
✕
D
\(0.95\)
✕
E
\(3.73\)
✕
Question 31 of 34
| MCQ
· Level 3
[Calc] \(f(x) = \sqrt{x}\). Rate at \(c\) twice rate at \(x=1\). \(c=\)