Which of the following is NOT a factor of 124 - 54?
7
13
17
49
169
Correct answer is D
124 - 54 = (122)2 - (52)2
= (122 + 52) x (122 - 52)
(144 + 25)(144 - 25)
= (169)(119)
Factors of above 169, 17, 13, 7
14
54
94
4
9
Correct answer is C
(20+4−12)2
= (1+(14)12)2
= (1+12)2
= (32)2=94
Write down the number 0.0052048 correct to three significant figures
0.005
0.0052
0.00520
5.2048
5204
Correct answer is C
0.0052048 = 0.00520
Find, correct to three significant figures, the value of √41830.
205
647
2050
6470
64.7
Correct answer is A
√41830=204.5238
≊ (to three significant figures)
p< 0
p\geq 0
p \leq 0
p < 1
p > 0
Correct answer is E
\frac{k}{k + 1} + \frac{k + 1}{k}
= \frac{k^2 + (k + 1)^2}{k(k + 10}
= \frac{2k^2 + 2k + 1}{k(k + 1}
let k = \frac{1}{2}
p = \frac{10}{3}
p > 0