Simplify $\frac{-39}{3}\times \frac{19}{5}\times \frac{-45}{38}$

Q. When simplified ${\left(-\frac{1}{27}\right)}^{-2/3}$is

(a) 9

(b) −9

(c) $\frac{1}{9}$

(d) $-\frac{1}{9}$

Q.

117 + 9 = 117 + 10 - 1 = 127 - 1

Is the above expression is correct?

Q. Simplify the expression.

(i) $45÷5+20\times 4-12$ (ii) $\left(38-8\right)\times 2÷5+13$

(iii) $\frac{5}{3}+\frac{4}{7}÷\frac{32}{21}$ (iv) $3\times \left\{4\left[85+5-\left(15÷3\right)\right]+2\right\}$

Q. Determine whether the following numbers are prime or composite.

(1) 93
(2) 97
(3) 101
(4) 117
(5) 127
(6) 295
(7) 407
(8) 499
(9) 527
(10) 637
(11) 689
(12) 209
(13) 901
(14) 953
(15) 997