Answer:
262 books sold
Step-by-step explanation:
This is a very vague word problem, but if it truly is just asking the amount of books sold (regardless of music or science), here's how to get the answer:
1. 287+134=421 - first you want to add together the two types of books to get the total amount of books in the store
2. 421-x=159 - create an equation and solve.
3. -x=-262 - follow order of operations and subtract 421 on both sides in order to isolate the variable
4. x=262 - divide each side by -1 to make the variable positive.
If you'd like an easier way, you can just:
1. 421-159=262 - it's easier, but my math teacher would count us wrong if we didn't do equations a specific way. Good luck!
Answer: $=p x 85% or $=p x .85
Step-by-step explanation:
100-15=85
Hope this helps!
Answer:
5-46i
Step-by-step explanation:
1. Multiply (10-4i) and (4-5i), I recomnd using foil:
40-50i-16+20i^2 + (-15+20i)
2. Remove the parenthesis around -15+20i
*we can do this since there is a "+":
40-50i-16+20i^2 + (-15)+20
3. Simplify i^2
* i^2 is -1 by textbook defination:
40-50i-16+20(-1) + (-15)+20
4. Simplify
40-50i-16-20 + (-15)+20
6. Combine like terms:
-5-50i-16i+20i
5-46i
And the problem is done
Wouldn’t it be the 7th root of 3? It’s a 30 60 90 triangle which means x=7 on that side so x on the bottom is the x root of three?
Answer:
1. 
2. 
Step-by-step explanation:
1. 
Do cross multiplication
Distribute 3 through the parentheses
Move 3x to left hand side and change it's sign
Collect like terms
Divide both sides by 3
Calculate
The value of x is 1
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2. 
Do cross multiplication
Distribute 2 through the parentheses
Similarly, distribute 6 through the parentheses
Move 12n to left hand side and change it's sign
Similarly, move 48 to right hand side and change it's sign
Collect like terms
Add the numbers : 48 and 2
Divide both sides by -10
Calculate
The value of n is -5 .
Hope I helped!
Best regards! :D
