Evaluate, correct to four significant figures, (573.06 x 184.25).
105600.00
105622.00
105500.00
105632.00
Correct answer is A
573.06 x 184.25 = 105,586.305
1,05600.00 to four significant figure
What are the Rules for significant figures?
Significant Figures
- All non-zero numbers ARE significant.
- Zeros between two non-zero digits ARE significant.
- Leading zeros are NOT significant.
- Trailing zeros to the right of the decimal ARE significant.
- Trailing zeros in a whole number with the decimal shown ARE significant.
If a dress is sold for #3800.00 at 20% discount. what is its original price?
#3,000.00
#4,000.00
#5,000.00
#4,750.00
Correct answer is D
It is given that the cost of the item reduces to #3800.00 after the discount on the item.
Let original price = x
x – (20% of x) = 100
⇒ x – 0.2x = 100
⇒ 0.8x = #3800
⇒ x = \(\frac{3800}{0.8}\)
⇒ x = 4,750
The number line represented by the inequality
x≤2
x<2
x≥2
x>2
Correct answer is C
x ≥ 2 is represented by an arrow with an filled-in dot above the 2.
The arrow points in the direction of all the numbers that are greater than 2.
x <-2
x>2
x>-2
x<2
Correct answer is A
Three times a certain number (x) = 3x
minus 2 = -2
is less than = <
the number minus 6 = x -6
Mathematically; 3x - 2 < x - 6
collect like terms
3x - x < -6 + 2
2x < -4
x < -2 is the possible values of x
If n(P) = 20 and n(Q) = 30 and n(PuQ) = 40, find the value n(PnQ)
10
30
15
40
Correct answer is A
n(PuQ) = n(p) + n(q) - n(PnQ)
40 = 20 + 30 - n(PnQ)
n(PnQ) = 50 - 40 = 10
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