<span>Equation:
silver + silver = silver
0.45x + 0.60(40-x) = 0.48*40
----------------
45x + 60*40 - 60x = 48*40

--------
-15x = -12*40
x = (4/5)40
x = 32 lbs (amt of 45% slloy needed)
40-x = 8 lbs (amt of 60% alloy needed)</span>

8 0

3 years ago

How do you solve this can someone help me pls

horrorfan [7]

Answer:

x-8°+20°= 90°

=>x+12°=90°

=>x=90°-12°

=>x= 78°

5 0

4 years ago

The measure of an angle is 28 degrees less than its supplement. find the supplement

barxatty [35]

Supplementary angles measure 180°. Make an equation:

$x+(x+28) = 180$

Subtract 28 to leave the variable in the parentheses alone:

$x+(x+28-28) =180-28 \\ x+x = 152$

Add the 2 x's together:

$x+x = 2x$

Your new equation is:

$2x=152$

Divide both sides by 2 to leave the variable alone

$\frac{2x}{2} = \frac{152}{2} \\ \\ x = 76$

The supplement measures 76°

8 0

4 years ago