Question

!!!!!!!!!!!!!! 2in1 !!!!!!!!!!! Urgent !!!! 
1) Calculati media aritmetica a numerelor: a=$8-3 \sqrt{7} + \frac{1}{2} (3+ \sqrt{7} ) ^{2}$ si b=24. 

2) O firma are 120 de angajati. Determinati numarul barbatilor angajati in firma , stiind ca numarul femeilor reprezinta 20% din numarul barbatilor . 

MULTUMESC!

Answer 1

$a=8-3\sqrt7+\dfrac12(9+6\sqrt7+7)$

$a=8-3\sqrt7+\dfrac12(16+6\sqrt7)$

$a=8-3\sqrt7+8+3\sqrt7=16$

$m_a=\dfrac{a+b}{2}=\dfrac{16+24}{2}=20$

2)

x= numarul barbatilor

20x/100=x/5=nr. femeilor

x+x/5=120

6x=120·5

x=20·5=100 barbati

Femei= 100/5=20