3.78m
3.80m
4.18m
4.20m
4.788m
Correct answer is D
Let the actual length of the room = y m
\(\therefore \frac{y - 3.99}{y} \times 100% = 5%\)
\(100(y - 3.99) = 5y \implies 100y - 399 = 5y\)
\(100y - 5y = 399 \implies y = \frac{399}{95}\)
y = 4.2 m
If log\(_{10}\) a = 4; what is a?
0.4
40
400
1000
10000
Correct answer is E
log\(_{10}\) a = 4
a = 10\(^4\)
= 10000
Simplify 0.63954 ÷ 0.003 giving your answer correct to two significant figures
213.18
213.00
213
210
21
Correct answer is D
= \(\frac{0.63954}{0.003}\)
moving the decimal places, we have
= \(\frac{639.54}{3}\)
= 213.18
\(\approxeq\) 210 (to 2 s.f.)
Cos x is negative and sin x is negative.Which of the following is true of x?
0o < x < 90o
90o < x <180o
180o < x < 270o
270o < x <360o
-90o < x <90o
Correct answer is C
In the 3rd quadrant, only the tan of angles are positive.
The 3rd quadrant = 180° < x < 270°
If log\(_{10}\) q = 2.7078, what is q?
5102
849.9
510.2
84.99
51.02
Correct answer is C
q = 10\(^{2.7078}\)
Antilog of 2.7078 = 510.2