3 (4x + 7) = 43; 12x + 21 = 43 O Commutative Property
Associative Property
O Addition Property
O Distribution Property

Distributive property

Explanation:

You are distributing the 3 to the parenthesis to get 12x+21 =43

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°

the circumference of a circle is, 10.676 cm.

step-by-step explanation:

the formula for circumference of a circle is given by:

where

c is the circumference of a circle and

d is the diameter of a circle.

given: diameter(d) = 3.4 cm and use

substitute these values in [1] we get;

cm

therefore, the circumference of a circle is, 10.676 cm