Question

1. Liza and Marta mow lawns during the summer to earn money. Liza determined that she can earn between $6.00 and $6.25 per hour. Marta estimates that she earns between $7.50 and $8.00 per hour. About how much more money will Marta earn than Liza if they each work 22 hours?
A. $25.01 to $45.00
B. $65.01 to $85.00
C. $45.01 to $65.00
D. $5.00 to $25.00
2. Last month, Belinda worked 160 hours at a rate of $10.00 per hour. If her employer retains 9% of her gross salary, is $1,500 a reasonable estimate of her net salary?
A. Yes, because $1,500 is close to
B. No, because $1,300 is a better estimate.
C. No, because retaining 10% of her salary would leave her with about $1,350.
D. Yes, because her salary will be a bit more than

Answer 1

R1 = 2 ohm           R2 = 3 ohm           R3 = 6 ohm           (a)  When R2 and R3 are connected in parallel with R1 in series we get                 1/R = 1/R2 + 1/R3                 g= 1/3 + 1/6                 = 1/2                 Thus, R = 2 ohm                 Resistance in series = R + R1                 = 2 + 2                 = 4 ohm

          (b)  When R1,R2, R3 are connected in parallel we get                 1/R = 1/R1 + 1/R2 + 1/R3                 = 1/2 + 1/3 + 1/6                 = 1 ohm.