Maya is cleaning out her closet and is shocked when she realizes that she has 55 shirts. She decides to donate 40% of them. How many more shirts does she have for her ?
Answer:
The number of T-shirt that Maya will have after donating 40% is 22 shirts
Explanation:
Given:( as per the above data provided)
Total number of T-shirts = 55
Percentage of T-shirts she wish to donate = 40%
To find:
Remaining number of T-shirt left after donating?
Formula to be used:
Remaining T shirt = (Total number of T-shirt /100) X The Percentage of T-shirt she wish to donate
Steps:
Substituting all the above provided values in the formula we get,
= (55/100)*40
= 22 shirts.
Thus the number of T-shirts left with her is 22.
Razi might be wrong because the percentage of votes is related to the number of votes. And the percentage just indicates the ratio, not the actual number.
For example, let's assume that voters cast exactly 1000 votes last year. Since this political party received 65 percent of the votes last year, it received 650 out of 1000 votes.
Let's assume that voters cast 100 votes in the elections this year. In this case, this political party, which received 70 percent of the vote, received 70 votes out of 100 this year.
In this scenario, although the party's percentage of votes increased, the number of votes decreased.
Answer:
Step-by-step explanation:
Given that in order to efficiently bid on a contract, a contractor wants to be 95% confident that his error is less than two hours in estimating the average time it takes to install tile flooring.
Std deviation =4.5 errors
95% confidence interval = Mean±1.96*std dev
Hence we have
Sample size should be 20.
Quadratic formula is derived from completing the square:
<span>ax² + bx + c = 0 </span>
<span>ax² + bx = −c </span>
<span>x² + b/a x = −c/a </span>
<span>Complete square on left side by adding (b/(2a))² to both sides: </span>
<span>x² + b/a x + (b/(2a))² = (b/(2a))² − c/a </span>
<span>(x + b/(2a))² = (b²−4ac)/(2a)² </span>
<span>x + b/(2a) = ± √(b²−4ac)/(2a) </span>
<span>x = −b/(2a) ± √(b²−4ac)/(2a) </span>
<span>x = (−b ± √(b²−4ac)) / (2a) </span>
<span>- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - </span>
<span>or </span>
<span>ax² + bx + c = 0 </span>
<span>ax² + bx = −c </span>
<span>4a (ax² + bx) = −4ac </span>
<span>4a²x² + 4abx = −4ac </span>
<span>Complete the square on left side by adding b² to both sides </span>
<span>4a²x² + 4abx + b² = b²−4ac </span>
<span>(2ax + b)² = b²−4ac </span>
<span>2ax + b = ± √(b²−4ac) </span>
<span>2ax = −b ± √(b²−4ac) </span>
<span>x = (−b ± √(b²−4ac)) / (2a)</span>