Question

Round the numbers in each expression to the nearest whole number.

Then select all expressions that are about 8.

A.
3
1
5
+
5
7
9
B.
15
5
7
−
8
2
9
C.
1
5
8
+
5
2
5
D.
10
1
4
−
1
11
15
E.
2
7
10
+
4
8
9

Answer 1

The expressions that are about 8 are 15(5)/(7) - 8(2)/(9) and 2(7)/(10) + 4(8)/(9).

How to round the numbers in each expression to the nearest whole number

Let's round the numbers in each expression to the nearest whole number:

A. 3(1)/(5) + 5(7)/(9)

3(1)/(5) ≈ 3

5(7)/(9) ≈ 6

The expression becomes: 3 + 6 = 9

B. 15(5)/(7) - 8(2)/(9)

15(5)/(7) ≈ 16

8(2)/(9) ≈ 8

The expression becomes: 16 - 8 = 8

C. 1(5)/(8) + 5(2)/(5)

1(5)/(8) ≈ 2

5(2)/(5) ≈ 5

The expression becomes: 2 + 5 = 7

D. 10(1)/(4) - 1(11)/(15)

10(1)/(4) ≈ 10

1(11)/(15) ≈ 1

The expression becomes: 10 - 1 = 9

E. 2(7)/(10) + 4(8)/(9)

2(7)/(10) ≈ 3

4(8)/(9) ≈ 5

The expression becomes: 3 + 5 = 8

From the rounded expressions, the expressions that are about 8 are:

B. 15(5)/(7) - 8(2)/(9)

E. 2(7)/(10) + 4(8)/(9)

Therefore, the expressions that are about 8 are 15(5)/(7) - 8(2)/(9) and 2(7)/(10) + 4(8)/(9).

Round the numbers in each expression to the nearest whole number. Then choose all expressions that are about 8 . C. 3(1)/(5)+5(7)/(9) B. 15(5)/(7)-8(2)/(9) C. 1(5)/(8)+5(2)/(5) D. 10(1)/(4)-1(11)/(15) E. 2(7)/(10)+4(8)/(9)

Answer 2

(9a4 + 2a2 + 5) – (16a4 – 7a2 + 1)

A. 25a4 – 5a2 – 4

B. –7a4 – 5a2 + 6

C. 25a8 + 9a4 + 6

D. –7a4 + 9a2 + 4

5.Multiply 9x2(2x2 + 8x).

A. 18x4 + 72x3

B. 18x2 + 72x3

C. 11x4 – 17x3

D. 90x4