Hi!

To answer this, first we have to find how much 1 notebook costs. We can do this by dividing:

Cost/amount = ?

Or in this case

5.25/5 = 1.5

Now we have to find how much 3 notebooks cost. We can do this by multiplying:

Cost of one x amount = ?

Or in this case

1.5 x 3 = 3.15

The answer is 3.15

Hope this helps! :)

6 0

3 years ago

A circular dog bed has a

madreJ [45]

Answer:

23 inches

Step-by-step explanation:

Circumference = 2πr

72 = 2×3.142×r

Divide through by 2 × 3.142

r = $\frac{72}{2 * 3.142}$

r = 11.458 inches

Diameter = 2r

Diameter = 2* 11.458 = 22.92

= 23 inches to the nearest inch

3 0

3 years ago

Factor 1.21a^6+22a^3+100

Monica [59]

Answer:

$\frac{1}{100} (11 {a}^{3} + 100)(11 {a}^{3} + 100)$

Step-by-step explanation:

$1.21 {a}^{6} + 22 {a}^{3} + 100 \\ = 1.21 {a}^{6} + 11 {a}^{3} + 11 {a}^{3}+ 100 \\ = 11 {a}^{3} (0.11 {a}^{3} + 1) + 100(0.11 {a}^{3} + 1) \\ = (0.11 {a}^{3} + 1) (11 {a}^{3} + 100) \\ = ( \frac{11}{100} {a}^{3} + 1) (11 {a}^{3} + 100) \\ = ( \frac{11{a}^{3} + 100}{100} ) (11 {a}^{3} + 100) \\ = \frac{1}{100} (11 {a}^{3} + 100)(11 {a}^{3} + 100) \\ are \: the \: required \: factors.$

4 0

3 years ago