In a sofa store 30% of the sofas are leather. 40% of the leather sofas are black. what percentage of the total number of sofas are made form black leather?

12%

Step-by-step explanation:

Given,

% of leather sofas = p(A) = 30% = 30/100 = 0.3

% of leather sofas that are black = p(B) = 40% = 40/100 = 0.4

The percentage of total sofas made from leather = p(A) * p(B)

= 0.3 * 0.4

= .12

= 12%  

last option: rhombus or kite

step-by-step explanation:

a kite and rhombus have the same shape. as we don't have any specific formula for the calculation of area of kite. the diagonals are used to calculate the area of a kite or rhombus.

the formula for area of rhombus is given by:

here, d_1 is the first diagonal and d_2 is the second diagonal.

so,

last option is the correct answer ..

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.