Answer:
associative property of multiplication
Step-by-step explanation:
Associative property of multiplication states that (a x b) x c = a x (b x c).
5 * (sqrt(9) *4) = (5* sqrt(9) ) *4
Answer:
0.15590200
Step-by-step explanation:
I learned that you would find the reciprocal of the number. For example:
-2
To find the reciprocal you would put 1 over 2 so 1/2. I think it is to find the reciprocal.
Answer:
XY= 50
Step-by-step explanation:
Do the equation 6x-26/2=2x+8
This becomes 6x-26=4x+16 once you multiply the 2 on both sides
Solve to get x=21.
Plug that into 2x+8
2(21) +8
42+8
50
Answer:
Step-by-step explanation:
26% is (26-20)/(50-20) = 6/30 = 1/5 of the way between 20% and 50%. That means 1/5 of the solution is 50% acid.
50% acid: 1/5 · 100 mL = 20 mL
20% acid: 100 mL -20 mL = 80 mL
Delbert must mix 80 mL of 20% acid and 20 mL of 50% acid.
_____
Maybe you'd like to see an equation. Let x represent the amount of 50% acid required. Then 100-x is the amount of 20% acid needed. The amount of acid in the mix is ...
0.50(x) +0.20(100 -x) = 0.26(100)
(0.50 -0.20)x = (0.26 -0.20)100 . . . . subtract 0.20(100)
x = (0.26 -0.20)/(0.50 -0.20)×100 = 20
This last expression should look a lot like the one we started with in this answer. It shows you how you can almost write down the answer to mixture problems without a lot of work.