Answer:
1. c = 13
2. a = 20
Step-by-step explanation:
1. 12² + 5² = x²
144 + 25 = x
144 + 25 = 169
√169 = 13
2. 29² - 21² = x²
841 - 441 = x
841 - 441 = 400
√400 = 20
Steps to solve:
5 + (8 + 2)
~Solve whats in parenthesis
5 + 10
~Add
15
Best of Luck!
Short answer: 100
I assume you want to find x.
We want an equation that says that x is equal to 105cm, minus that 5 percent, because that is his height before the 5% was added. That looks like:
x + 0.05x = 105
(0.05 is 5% in decimal form, which is necessary in equations like this).
x + 0.05x = 1.05x
1.05x = 105.
Isolate x by dividing both sides by 1.05
1.05x / 1.05 = x, 105 / 1.05 = 100
x = 100, so he was 100cm tall before summer
My original answer was 99.75. This is wrong because I used the 5% of 105, which is wrong because in the question it says his original height (which is x) had 5% added to it. So its 5% of x, not 5% of 105. This changes the whole equation.
Answer:
214 books
Step-by-step explanation:
136-58= 78 books in the second box
so to find the total you add the amount of books in the first box with the amount of books in the second to = 214
Let a number = x
therefore the sum of a number times 3 = 3x
and 6 means 3x+6 equals 4
so the equation is 3x+6=4
