30

54

150

180

$480

$540

$600

$900

2 tens

2 ones

2 tenths

2 hundreds

$(25\ \times100)+30$

$(25+30)\times100$

$(25\times30)+(25\times100$

$(100\times30)+(100\times25)$

91

93

97

99

27

36

54

72

3

5

12

15

$\left\{4\right\}$

$\left\{a,\ b,\ c\right\}$

$\left\{p,\ q,\ r,\ s\right\}$

$\left\{1,\ 2,\ 3,\ 4,\ 5\right\}$

$Q\ ∩\ R$

$P\ ∩\ R$

$P\ ∩\ Q$

$P\ ∪\ Q$

2

3

4

8

$1.62

$15.52

$16.00

$16.25

$1.80

$10.00

$18.00

$170.00

$105

$210

$370

$1,050

$1.67

$6.00

$7.20

$12.15

$44.00

$47.00

$53.00

$56.00

$495

$525

$825

$1,320

$320.00

$21.50

$22.40

$31.50

$\frac{4}{9}\ \%$

$2\frac{1}{4}\ \%$

$5\ \%$

$44\ \%$

$10a^3$

$10a^6$

$16a^3$

$16a^6$

$5xy$

$5\left(x+y\right)$

$2x+3y$

$3x+2y$

$x\ge3$

$x>3$

$x\ge6$

$x>6$

$-\frac{3}{4}$

$\frac{1}{4}$

$3$

$4$

$-4$

$-\frac{16}{5}$

$\frac{16}{5}$

$4$

(0, -3)

(2, 3)

(-3, -1)

(4, 1)

$\left\{0,1,8\right\}$

$\left\{-2,-1,0,1,2\right\}$

$\left\{-6,-3,0,3,6\right\}$

$\left\{-8,-1,0,1,8\right\}$

$\frac{5}{13}$

$\frac{5}{12}$

$\frac{12}{5}$

$\frac{12}{5}$