Simplify the following expression and find their value for the given values of the variables:

$16a+15b-10a-4b\text{ for }a=11\text{ and }b=8$.

Simplify the following expression and find their value for the given values of the variables:

$4x^3+x-10-\left(4x^2+5x\right)\text{ for }x=3$.

Simplify the following expression and find their value for the given values of the variables:

$10pq+p^{2}q-\left(q{p}^2+2p{q}^2+5\right)\text{ for }p=1\text{ and }q=2$.

Simplify the following expression and find their value for the given values of the variables:

$-2y^2+13y+10-10y+6y^2\text{ for }y=-2$.

For what value of $a$ will $-p^3+15ap+p^2-9\text{ equal }16\text{ for }p=5?$

For what value of $p$ will the expression $16x+2x^2+5p\text{ equal }50\text{ at }x=-3?$

Last month, Mohit had $\left(2x-10\right)$ rupees in his piggy bank. After a month, he has $\left(5x+2\right)$ rupees. How much more money does Mohit have now?

There are $x$ white rose plants and $4$ more red roses plants than the white rose plants in the balcony of Mr Sharma. He further planted $6$ more white rose plants and $4$ red rose plants. How many plants are there in his balcony now?

The length of a football ground is $30$ m less than twice its breadth. If the breadth is $x$ metres, write the length of ground.