here are 20 girls and 15 boys in a class.

(a)What is the ratio of number of girls to the number of boys?

(b)What is the ratio of girls to the total number of students in the class?

Classify into monomials, binomials and trinomials:

(i) {tex}4y – 7x{/tex}

(ii) {tex}{y^2}{/tex}

(iii) {tex}x + y – xy{/tex}

(iv) {tex}100{/tex}

(v) {tex}ab – a – b{/tex}

(vi) {tex}5 – 3t{/tex}

(vii) {tex}4{p^2}q – 4p{q^2}{/tex}

(viii) {tex}7mn{/tex}

(ix) {tex}{z^2} – 3z + 8{/tex}

(x) {tex}{a^2} + {b^2}{/tex}

(xi) {tex}{z^2} + z{/tex}

(xii) {tex}1 + x + {x^2}{/tex}