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3 years ago

13

T-7=19 what is the answer and how do you do it

1 answer:

jeka57 [31]3 years ago

7 0

T=26
you just add 7 to the other side with 19 which gives you the answer

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Solve this using the quadratic formula. Show work<br><br> 2x^2+7x−5=0

kozerog [31]

Multiply the numbers (2*2=4)
$=\frac{-7+\sqrt{7^2-4\cdot \:2\left(-5\right)}}{2\cdot \:2}$

Apply the rule
$\sqrt{7^2+2\cdot \:4\cdot \:5}$

7^2 =49
$=\sqrt{49+2\cdot \:4\cdot \:5}$

Multiply
$\sqrt{49+40}$

Add
$\sqrt{89}$

$=\frac{-7-\sqrt{89}}{4}$

Final solution:
$x=\frac{-7+\sqrt{89}}{4},\:x=\frac{-7-\sqrt{89}}{4}$

8 0

4 years ago

An experimenter studies vision in low light by

Mariulka [41]

Answer:

Independent variable- time spent in the dark room

Dependent variable - number of objects correctly identified

Conditions of the experiment- low light environment and lighted environments

Scores from the independent variable are used to construct the frequency distribution

Step-by-step explanation:

The independent variable is the factor that is being manipulated in an experiment and this time it is the time spent in a darkened room.

The dependent variable is the response variable, in this case, the number of objects correctly identified.

The experimental conditions involved bringing people from a lighted area into a darkened room.

3 0

3 years ago

There are 150 adults and 255 children at a zoo. The zoo makes a total of $4,500 from the entrance fees, and the cost of an adult

Sergio039 [100]

Answer:

y+x=31, 150x+225y=5100.

y=-x+31

150x+225(-x+31)=5100

-75x=-1875

x=25 (adult tickets are $25)

31-25= 6 (child tickets are $6)Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

The general form of a circle is given as x^2+y^2+4x - 12y + 4 = 0. A) What are the coordinates of the center of the circle? B) W

Alex_Xolod [135]

Answer:

center = (-2, 6)

radius = 6

Step-by-step explanation:

<u>Equation of a circle</u>

$(x-a)^2+(y-b)^2=r^2$

(where (a, b) is the center and r is the radius)

Therefore, we need to rewrite the given equation into the standard form of an equation of a circle.

Given equation:

$x^2+y^2+4x-12y+4=0$

Collect like terms and subtract 4 from both sides:

$\implies x^2+4x+y^2-12y=-4$

Complete the square for both variables by adding the square of half of the coefficient of $x$ and $y$ to both sides:

$\implies x^2+4x+\left(\dfrac{4}{2}\right)^2+y^2-12y+\left(\dfrac{-12}{2}\right)^2=-4+\left(\dfrac{4}{2}\right)^2+\left(\dfrac{-12}{2}\right)^2$

$\implies x^2+4x+4+y^2-12y+36=-4+4+36$

Factor both variables:

$\implies (x+2)^2+(y-6)^2=36$

Therefore:

center = (-2, 6)
radius = √36 = 6

7 0

2 years ago

Martin is saving for a gaming system. The total cost of the gaming system and three games is $325.49. About how much money shoul

sweet [91]

Martin should save about $33.00 per week to purchase the gaming system and games in 10 weeks.

5 0

3 years ago