Multiply (2.0 ⋅ 10^−4) ⋅ (3.1 ⋅ 10^−20). express the answer in scientific notation.

6.2 × 10⁻²⁴

Step-by-step explanation:

  (2.0 × 10⁻⁴)(3.1 × 10⁻²⁰)

= (2.0 × 3.1)( 10⁻⁴ × 10⁻²⁰)

= 6.2 × 10⁻²⁴

option a, c,d are correct.

step-by-step explanation:

from the given figure, it is given that z is equidistant from the sides of the triangle rst, then from triangle tzb and triangle szb, we have

tz=sz(given)

bz=zb(common)

therefore, by rhs rule,δtzb ≅δszb

by cpctc, sz≅tz

also, from δctz and δasz,

tz=sz(given)

∠tcz=∠saz(90°)

by rhs rule, δctz ≅ δasz, therefore by cpctc, ∠ctz≅∠asz

also,from δasz and δzsb,

zs=sz(common)

∠zbs=∠saz=90°

by rhs rule, δasz ≅δzsb, therefore, by cpctc, ∠asz≅∠zsb

hence, option a, c,d are correct.