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2 years ago

A fish tank that holds 80 gallons of water is 55% full. how much do you need to fill the tank

Mathematics

1 answer:

lina2011 [118]2 years ago

6 0

Answer: You need 36 gallons of water to fill the tank.

Step-by-step explanation:

<u>Find out how much 55 percent of 80 gallons is:</u>

55/100

x/80

55x80=4400/100=44

44 gallons are currently in the tank

<u>Then, subtract that amount from the total:</u>

80-44=36

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Eight values have a mean of 7. a ninth value is added. the new mean is 9. what is the new value

My name is Ann [436]

Answer:

25 because the 8 values must times with 7 and will get 56. when the ninth value added , let the ninth value as y , 56+y , the new mean is 9 . so it will be like this , 56+y over 9 times with 9

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2 years ago

Graph the function y = 1 /3 x − 2.

Virty [35]

Answer:

start at the point (0,-2) and go up one and to the right three, keep going until you run out of room. then, draw a straight line through all the points :)

Step-by-step explanation:

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3 years ago

A middle school yearbook committee has 35 members. There are 7 more girls than boys. Write a system of linear equations, define

frez [133]

if the number of boys is x ,then the number of girls is x+7,so 2x+7=35,we can know x=9,so the number of boys is 9,and girls are 16

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2 years ago

1.) Use the quadratic formula to solve the equation. If necessary, round to the nearest hundredth .x squared minus 21 x equals n

Andrew [12]

Part 1
We are given $x^2-21x=-4x$ . This can be rewritten as $x^2-18x=0$ .
Therefore, a=1, b=-18, c=0.
Using the quadratic formula
$x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}=\frac{-\left(-18\right)\pm \sqrt{\left(-18\right)^2-4\left(1\right)\left(0\right)}}{2\left(1\right)}$
$x=\frac{18\pm 18}{2}$

The values of x are
$x_1=\frac{18-18}{2}=0$
$x_2=\frac{18+18}{2}=18$

Part 2
Since the values of y change drastically for every equal interval of x, the function cannot be linear. Therefore, the kind of function that best suits the given pairs is a quadratic function.

Part 3.
The first equation is $y=x^2+2$ .
The second equation is $y=3x+20$ .

We have
$x^2+2=3x+20$
$x^2-3x-18=0$
Factoring, we have
$\left(x-6\right)\left(x+3\right)=0$
Equating both factors to zero.
$x_1-6=0\rightarrow x_1=6$
$x_2+3=0\rightarrow x_2=-3$

When the value of x is 6, the value of y is
$y=3\left(6\right)+20=38$

When the value of x is -3, the value of y is
$y=3\left(-3\right)+20=11$

Therefore, the solutions are (6,38) or (-3,11)

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2 years ago

Bill $42 , tax 9% , tip 18%

STatiana [176]

Answer:

Tax 3.78 $ and tip 7.56 $

Step-by-step explanation:

42*0.09 = 3.78

42*0.18 = 7.56

8 0

2 years ago