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andrey2020 [161]
2 years ago
8

John is 5 years younger than David. Four years later David will be twice as old as John. Find their present age.​

Mathematics
1 answer:
Harrizon [31]2 years ago
7 0

David will be 10 and John will be 9

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Please help me! I will give Brainlylist
Zinaida [17]

Answer:

I would say that they are different because if x - a has a value to the equation then that means a - x will not have the same value because it may be rearranged to a different equation but that doesn't mean that they will have the same value. that explain why x - a and a - x are not the same

7 0
3 years ago
(Please help its due in 5 min!!!!)A study was designed to determine the relationship between driving speed and gas consumption f
S_A_V [24]
B. The independent variable is the driving speed, and the dependent variable is the gasoline consumption.

Gasoline consumption will either increase or decrease based on the driving speed of the car.

The weight of the car is not essential in determining the relationship between driving speed and gas consumption.

6 0
4 years ago
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Solve the equation with special factors. (Please show all steps) <br> 4p^4 - 25p^2 = -16p^2
daser333 [38]

Answer:

The solutions can be p=3/2 or p=-3/2

Step-by-step explanation:

4p^4 - 25p^2 + 16p^2 = 0

4p^4 - 9p^2 = 0

4p^2 - 9p = 0

p^2 = 9/4

p = sqrt(9/4)

p = 3/2 or p = -3/2

7 0
3 years ago
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A bridge is built in the shape of a semielliptical arch. It has a span of 112 feet. The height of the arch 26 feet from the cent
katen-ka-za [31]
Solve this using standard form of ellipse equation: <span>(x−h<span>)^2</span>/<span>a^2</span>+(y−k<span>)^2</span>/<span>b^2</span>=1.

</span><span>Put the center of the ellipse at (0,0), then h=k=0, so that simplifies things. If the span is 112 feet, then the semi-major axis in the x direction is 56, that would be 'a' I think you have to use the given information to solve for 'b.'

</span><span>Getting 13.5488, so 13.5 or 13.55 feet seems fine as a rounded answer.</span>
7 0
3 years ago
At the beginning of the day the stock market goes down 4014 40 1 4 points and stays at this level for most of the day. At the en
Stels [109]

Answer:

<h2>124.51%</h2>

Step-by-step explanation:  

In this problem, we are expected to solve for the percentage change, given the opening  point and the closing point

given that the low is 4014

and the high is  9012

the formula to calculate the percentage change is given as

%change= (high-low)/low*100

substituting our given data we have

%change= (9012-4014)/4014*100

%change= (4998)/4014*100

%change= (1.2451)*100

%change= 124.51%

The total change in the stock market from the beginning of the day to the end of the day is 124.51%

7 0
3 years ago
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