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### Allen invests $\$4250$at$2.5\%$of a simple interest. What will be the amount earned after 20 years ? ### Which of these functions describe exponential decay ? ###$\begin{pmatrix}\large\frac{xy^n}{(xy)^{2n}} \end{pmatrix}^{2n}$if$x=-2, \; y=3$and$n=-1$### Evaluate :$\large\frac{3^5 \times 3^{-2}}{(3^{-3})^2}$### Calculate number of bromide ions in 3 moles of mercury (II) bromide ### The product of two numbers is$25\large\frac{5}{6}$. If one of the numbers is$6\large\frac{2}{3}$, find the other. ### Find:$\large\frac{7}{11}$of$ 330$### If$P=\{x:sinx-cosx=\sqrt2 cosx\}$and$Q=\{x:sinx+cosx=\sqrt 2 sinx\}$then which of the following is true ? ### Find the value of$\phi'$### If$n(A\times B)=8, $then how many possible values are there for$n(A)?$### If$S_1=\{1,2,...................20\}$,$S_2=\{a,b,c,d,e\}$,$S_3=\{a,c,e,f\}$, then no. of elements of$(S_1\times S_2)\cap (S_1\times S_3)$is ? ### If$A\:and\:B$are two sets such that$(A-B)\cup B=A$, then what can you say about$A\:and\:B\$?

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