# 21$is 75% of what amount? 2 months ago ## Solution 1 Guest #3839 2 months ago 21 cents =75% divide both sides by 3 7cents= 25% multiply each side by 4 28=100% Answer=28 ## ðŸ“š Related Questions Question Mara ran 3km north ad then 4km east. she will finish her run by running directly home. What is the total distance of her run Solution 1 So we need to find the length of the hypotenuse of a right triangle with sides of 3 and 4, then add So we need to find the length of the hypotenuse of a right triangle with sides of 3 and 4, then add that distance to 3 and 4. By the Pythagorean Theorme, the hypotenuse squared is equal to the sum of the sides squared... d^2=3^2+4^2 d^2=9+16 d^2=25 d=âˆš25 d=5 So the total distance of her run is 5+4+3=12 km Solution 2 You can solve this with the Pythagorean theorem. 9+16=25, and the square root of 25 is 5. This is your answer. Question 15t+30+5t=-4t+6 please show step by step Solution 1 15t+4t+5t=6-30 24t=-24 t=-1 Question What is the probability of spinning a 4 or an odd number? Solution 1 Please explain further. Question Which of the following is the domain of the function G(F(x))? F(x) = x + 4, G(y) = G(F(x)) = A. All numbers less than or equal to 4 B. All numbers less than or equal to -4 C. All numbers greater than or equal to -4 D. All numbers greater than or equal to 4 Solution 1 Answer: option C. all numbers greater than or equal to -4. Justification: 1) G(F(x)) means apply first the rule F(x) and then apply the rule G(y) to the outcome of (Fx). 2) Mathematically that is: G(F(x) = G (x + 4) = 3)Â The the domain is all the numbers for which the expression inside the root are not negative, i.e x + 4 â‰¥ 0 â‡’ x â‰¥ - 4 That is the option C. all number greater than or equal to - 4. Question Josiah has 3 packs of toy animals. Each pack has the same number of animals. Josiah gives 6 animals to his sister stephanie. Then josiah has 9 animals left.how many animals were in each pack? Solution 1 Let the number of animals in each pack be x. Total number of animals will be 3x after Josiah gave 6 animals to his sister the remaining animals were: 3x-6=9 thus sloving for x we have: 3x-6=9 add 6 on both sides 3x-6+6=9+6 3x=15 divide both sides by 3 (3x)/3=15/3 x=5 Answer:Â There were 5 animals in each pack Question If 12 1/2% of a sum of money is$40 what is the total sum of money?
Solution 1

The total sum of money will be $320. Let the total sum of money be represented by x. Based on the information given, the equation to solve the question will be: 12 1/2% Ã— x = 40 0.125x = 40 Divide by 0.125 x = 40/0.125. x = 320 Therefore, the total sum of money will be$320.

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Solution 2
12 1/2% = 12.5%

12.5% = $40 1% = 40 Ã· 12.5 =$3.20

100% = $3.20 x 100 =$320

Question
What are the zeroes of 2x squared plus 6x minus 8
Solution 1
(2x-2)(x+4)=0 x=1 x=-4
Question
A ball is launched into the sky at 272 feet per second from the roof of a skyscraper 1,344 feet tall. The equation for the ballâ€™s height h at time t seconds is h = -16t2 + 272t + 1344. When will the ball strike the ground?
Solution 1

Time taken to reach the ball to the ground is 21 seconds. Â  Â  Â  Â  Â  Â  Â  Â  Â

Step-by-step explanation:

Given : A ball is launched into the sky at 272 feet per second from the roof of a skyscraper 1,344 feet tall. The equation for the ballâ€™s height h at time t seconds is .

To find : When will the ball strike the ground?

Solution :

The equation for the ball's height 'h' at time 't' is given by,

When the ball strike the ground the height of the ball became zero.

Substitute h=0 in the given equation,

Taking 16 common,

or

Solve by middle term split,

Reject t=-4 as time can never be negative.

Therefore, Time taken to reach the ball to the ground is 21 seconds.

Solution 2
Question
American cheese 0.45 to 4.26 what is the percent increase
Solution 1
For this case we have the following rule of three:
Â 0.45 ------> 100%
Â 4.26 ------> x
Â Clearing x we have:
Â x = (4.26 / 0.45) * (100)
Â x = 946.6666667%
Â Thus, the percentage of growth is:
Â 946.6666667 - 100 = 846.6666667
Â Rounding:
Â 846.7%
Â
the percent increase is:
Â
846.7%
Question
The average score on a standardized test is 750 points with a standard deviation of 50 points. What is the probability that a student scored more than 850 on the standardized test ?
Solution 1
The probability that student scored more than 850 we shall proceed as follows:
z=(x-Î¼)/Ïƒ
where:
x=850
Î¼=750
Ïƒ=50
thus
z=(850-750)/50
z=2
thus
P(x>850)=1-P(x<850)=1-P(z<2)=1-0.9772=0.0228

Solution 2

2%

Step-by-step explanation:

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