What is the missing number in the list of perfect squares 1,4,9,16,25,36,49,_,81,100,121,144
Yuri [45]
Answer:
64
Step-by-step explanation:
49= 7*7
81=9*9
8*8=64
Let's eliminate the variable x first. To do this, multiply the first row of this system by 5 and mult. the second row by -7:
7x-5y=14 => 35x - 25y = 70
5x+7y=64 => -35x - 49y = -448
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- 74y = - 378. Then y = 378/74 = 5.11.
Subbing 5.11 for y in the first equation, we get: 7x - 5(5.11) = 14. Then:
7x = 14+25.55 = 39.54. Dividing both sides by 7: x = 39.54/7 = 2.71
The solution is (2.71, 5.11). If this does not agree with any of your answer choices, please double check to ensure that you've copied down the original problem correctly.
Answer:
a) { 15, 16, 17, 18, 19, 20}
b) { 4, 8, 12, 16, 20}
Answer: x = 4
Step-by-step explanation:
Solving
9 + 3x = 21
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
1) Add '-9' to each side of the equation.
9 + -9 + 3x = 21 + -9
2) Combine like terms: 9 + -9 = 0
0 + 3x = 21 + -9
3x = 21 + -9
3) Combine like terms: 21 + -9 = 12
3x = 12
4) Divide each side by '3'.
x = 4
5) Simplifying
x = 4
#BaconSquad
It weighed 4 times the 5/8 of a pound
4 * 5/8
That is 5/2, or 2 1/2, or 2.5
Hope this helps