Question

Hi, please help me out :)) thank you

Answer 1

Answer:

d = 32

Step-by-step explanation:

$\sqrt{7d-1} -4+4=11+4$

$\sqrt{7d-1} =15$

$7d+1=15 *15$

$7d+1=225$

$7d=225-1$

$7d=224$

$d=\frac{224}{7}$

$d=32$

Answer 2

Answer:

d =32

Step-by-step explanation:

$\sqrt{7d+1}-4=11\\\\\mathrm{Add\:}4\mathrm{\:to\:both\:sides}\\\sqrt{7d+1}-4+4=11+4\\\\Simplify\\\sqrt{7d+1}=15\\\\\mathrm{Square\:both\:sides}:\quad 7d+1=225\\7d+1=225\\\\\mathrm{Solve\:}\:7d+1=225:\\\quad d=32$