Experts Only?

Question

1. The difference between -30 and -7.247 is 22.753.

True

False

2. In solving n/5 =3/20, n becomes 0.075

True

False

3. The sales tax on a $95 purchase is $7.60. The sales tax on a car costing $19,600 is $1600.

True

False

4. The Suarez family invests $10,000 at 9%, compounded monthly. $10,228.00 is in the account after three months.

True

False

5. Simplify (4/7) to the power 2 devided by 5/8 times 3/4 devided by (-8).

-12/245

-245/12

245/12

12/245

21/245

Answer 1

1. False (-22.753)

2. False (0.75)

3. False ($1568)

4. False ($10,217.78)

5. -12/245

Answer 2

1.  True

2.  False - 0.75

3.  False - $1568

4.  False - $10,226.69

5.  Your verbal description is inadequate to specify the mathematical priority.

Answer 3

1. false

2. false

3. false

4. false

5. -12/245

for question 3 and 4 is close, and for question 2, you have 1 zero too many. for question 1, it's -22.753 (-30 - -7.247)

Answer 4

First off, YAY MATH!!

1) The way you worded it, the answer is true. The way you asked the question, you are asking for an absolute value, which is always positive. When you actually subtract -30 - (-7.247), you get -22.753

2) False

n/5 = 3/20 (cross multiply)

20n = 5×3

20n = 15 (divide both by 20)

n = 3/4 (or .75)

3) False ($1,600 is an estimated answer)

$95 × 8% = $7.60

$19,600 × 8% = $1,568

4) True (it depends on where you round off your decimals)

A=P(1+r/n)^nt

A=10,000(1+.09/12)^12×.25

A=10,000(1.0075)^3

A=$10,226.69

5) (4/7)^2 / (5/8) × (3/4) / (-8)

(16/49) / (5/8) × (3/4) / (-8)

(128/245) × (3/4) / (-8)

(96/245) / (-8)

-12/245