Question

Based on what you've read, answer the following questions.

1. Use the distributive property to solve the following problems.
a. 8(5 + 25) = ?
b. 12(2 – 5) = ?
c. 3(5 – 12) = ?
d. 4(2 + 1) = ?

2. Find the value of the expression y ÷ (–2) + 5 if y equals –10.

3. Find the value of the expression x ÷ 3 + 10 if x equals 6.

4. Find the value of the expression 2z + 4 – 6 if z equals 12.

5. Find the value of the expression 6m + 4 4 + 11 if m equals 8.

Solve the following word problems.

6. John has been driving at 60 miles an hour for 3 hours. How many miles has he traveled so far? If the total distance to his destination is 240 miles, how much farther must John drive?

7. A cellular phone company bills customers $24.95 per month plus $0.20 a minute for each minute of phone time used. These charges can be expressed in a formula: B = $24.95 + ($0.20 M). In this formula, B stands for the total amount of the bill and M stands for the number of minutes used. This month, Carlos used 23 minutes of phone time. What will his total cellular phone bill be?

Answer 1

1) a:240

b:-36

c:-21

d:12

2) 10

3) 12

4) 22

5) 103

Explanation:

Answer 2

1.

a.

8(5 + 25) = ? Multiply the 8 times each of the numbers inside the parentheses separately.

8(5) + 8(25) = ?

40 + 200 = ? Multiply 8 times 5 (8 × 5 = 40). Multiply 8 times 25 (8 × 25 = 200). Add 40 and 200. Answer: 240

40 + 200 = 240

b.

12(2 − 5) = ? Multiply the 12 times each of the numbers inside parentheses separately.

12(2) − 12(5) = ?

24 − 60 = ? Multiply 12 times 2 (12 × 2 = 24). Multiply 12 times 5 (12 × 5 = 60). Subtract 60 from 24. Answer: −36

24 − 60 = −36

c.

3(5 − 12) = ? Multiply the 3 times each of the numbers inside parentheses separately

3(5) − 3(12) = ?

15 − 36 = ? Multiply 3 times 5 (3 × 5 = 15). Multiply 3 times 12 (3 × 12 = 36). Subtract 36 from 15 (15 − 36 = −21). Answer: −21

15 − 36 = −21

d.

4 (2 + 1) = ? Multiply the 4 times each of the numbers inside parentheses separately.

4(2) + 4(1) = ?

8 + 4 = ? Multiply 4 times 2 (4 × 2 = 8). Multiply 4 times 1 (4 × 1 = 4). Add 8 and 4 (8 + 4 = 12). Answer: 12

8 + 4 = 12

2.

y ÷ (−2) + 5 = ? Substitute −10 for y in the equation and solve.

−10 ÷ (−2) + 5 = ?

−10 ÷ (−2) + 5 = ? Perform the division operation first (−10 ÷ (−2) = 5).

5 + 5 = ?

5 + 5 = 10 Add (5 + 5 = 10). Answer: 10

3.

x ÷ 3 + 10 = ? Substitute 6 for x in the equation and solve.

6 ÷ 3 + 10 = ?

6 ÷ 3 + 10 = ? Perform the division operation first (6 ÷ 3 = 2).

2 + 10 = ?

2 + 10 = 12 Add (2 + 10 = 12). Answer: 12

4.

2z + 4 − 6 = ? Substitute 12 for z in the equation and solve.

2(12) + 4 − 6 = ?

2(12) + 4 − 6 = ? Perform the multiplication operation first (2 × 12 = 24).

24 + 4 − 6 = ?

24 + 4 − 6 = ? Add and subtract in order from left to right (24 + 4 = 28; 28 − 6 = 22). Answer: 22

28 − 6 = ?

28 − 6 = 22

5.

6m + 4 ÷ 4 + 11 = ? Substitute 8 for m in the equation and solve.

6(8) + 4 ÷ 4 + 11 = ?

6(8) + 4 ÷ 4 + 11 = ? Perform the multiplication and division operations in order from left to right. Multiply 6 times 8 (6 × 8 = 48).

48 + 4 ÷ 4 + 11 = ?

48 + 4 ÷ 4 + 11 = ? Divide (4 ÷ 4 = 1).

48 + 1 + 11 = ?

48 + 1 + 11 = ? Add in order from left to right (48 + 1 = 49; 49 + 11 = 60).

49 + 11 = ?

49 + 11 = 60 Answer: 60

Solutions to Word Problems

6.

D = RT Substitute the values into the distance formula and solve. John drove at a rate of 60 miles per hour, so the value of R is 60. He drove for a total of 3 hours, so the value of T is 3.

D = 60 • 3

D= 60 • 3 Multiply (60 × 3 = 180). The value of D is 180, so John has traveled 180 miles so far.

D = 180

240 − 180 = 60 Now, subtract 180 miles from 240 miles to find out how much farther John must drive to reach his destination. Answer: John will have to drive 60 more miles.

7.

B = $24.95 + ($0.20 × M) Carlos used 23 minutes of phone time this month, so substitute 23 for M in the formula and solve.

B = $24.95 + ($0.20 × 23)

B = $24.95 + ($0.20 × 23) Perform the operation in parentheses ($0.20 × 23 = $4.60).

B = $24.95 + $4.60

B = $24.95 + $4.60 Perform the addition ($24.95 + $4.60 = $29.55).

B = $29.55 Answer: Carlos’ cellular phone bill for the month is $29.55.

Explanation:

straight from pennfoster