How many types of gametes and in what ratio will be produced by a dihybrid heterozygote?

The law of dihybrid cross proves which of the following?

In a cross between $TTRr$ and $ttrr$,what percentage of the offspring will be tall with red flowers (in $\%$)? (Assume $T$ is tall,$t$ is dwarf,$R$ is red,and $r$ is white).

When a pure tall pea plant with green pods is crossed with a dwarf plant with yellow pods, how many $F_2$ offspring out of $16$ will be tall?

Pure homozygous offsprings in a dihybrid cross in the $F_2$ generation will be

$A$ pure breeding pea plant with round yellow seeds was crossed with a pea plant having wrinkled green seeds. On selfing of the $F_1$ hybrid of this cross,$64$ progenies were obtained in the $F_2$ generation. Find out the number of $F_2$ progenies showing non-parental characters.