Solving Equations
Solve for x:
x2 = 400
Give 2 possible answers
x = 20 or -20
A side of a square is 5a + 10 meters long. If the perimeter of the square is 120 meters, what is the value of a and the area of the square?
a= 4; The area of the square is 900 m2
2.0 x 10^3 in standard notation is
2000
Which expression is equivalent to (5^-2)^5 * 5^4?
5-6
Solve for x
(12-x)/2 = 6x+4
x= 4/11
What is the value of x if the area of a square is 729 inches and the length of each side is x3 ?
x = 3
True or False? 7.4 x 10^5 > 0.74 x 10^6
False! 740,000 equals 740,000
An atomic mass unit measures 0.00000000000000000000000166 grams Express this weight in scientific notation.
1.66 x 10^-24 grams
Simplify the expression:
4x-3(x-2y)+1/2(6x-8y)
4x+2y
The sum of Gilbert's grandparents' age is 183. If his grandpa is 5 years older than his grandma, how old is each of them?
Gilbert's grandpa is 94; Gilbert's grandma is 89
Scientific Notation or Not? Justify your answer. 0.32 x 10^2
Not! Must be one non-zero digit to the left of the decimal.
(7^8)(7^4) / 7^12
1
The longest side of a triangle is six more units than the shortest side. The third side is twice the length of the shortest side. If the perimeter of the triangle is 25 units, write and solve an equation to find the lengths of all three sides of the triangle.
x- shortest side
x +x+6+2x=25
shortest side- 19/4, other side- 19/2, longest side- 43/4,
Zane's age is twice his cousin's age. If they add their ages together, they get 36. How old are Zane and his cousin?
Zane is 24 and his cousin is 12.
Scientific Notation or Not? Justify your answer. 34.586 x 10^-3
Not! Must have only one non-zero digit on the left side of the decimal.
The diameter of a proton is 2 x 10^-14 meters Write this distance in standard form.
What is a proton?
0.00000000000002 meters
A proton is a subatomic particle with a mass defined as 1 and a charge of +1 (positive charge).
Dameek brought socks for his friends. One day, he bought 10 pairs of socks for $2.50 each and 3 pairs of shoes for
The cost of one pair of shoes is $36.99.
Barack Obama earned $400,000 a year during his presidency. About 35% is taken out for taxes. Approximately, how much did he pay in taxes during his 8 year presidency.
He paid about $1,120,000 in taxes.
Which of the following is equivalent to 36,000 x 10,000?
A 3.6 × 10^5
B 3.6 × 10^6
C 3.6 × 10^7
D 3.6 × 10^8
D
What is Ms. O's Birthday?
12/28