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3 years ago

Which system of equation should you use to solve this problem

Mathematics

1 answer:

Alex17521 [72]3 years ago

4 0

Last option is the correct answer.

Step-by-step explanation:

Given that

Let x stand for the solution a and y stand for the solution B

So,

According to statement that

30 gallons have to be made

$x+y=30$

Solution A contains 29 percent bromine => 0.29x

Solution B contains 53 percent =>0.53y

And the mixture of 30 gallons contains 45% bromine

$0.29x+0.53y=30*0.45\\0.29x+0.53y=13.5$

Following equations will be used for solving the problem

$x+y = 30\\0.29x+0.53y=13.5$

Hence,

Last option is the correct answer.

Keywords: Equations, Variables

Learn more about linear equations at:

#LearnwithBrainly

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(3,1)(2,0)(1,-1)(3,2)(2,1)(1,0) A: Function OB: Not a function

levacccp [35]

Answer:

Not a function

Step-by-step explanation:

Y values can repeat in a function but domain cannot. 3 is repeated twice, thus these values do not represent a function.

4 0

3 years ago

Martin throws a ball straight up in the air. the equation h(t) = -16t^2 + 40t + 5 gives the height of the ball, in feet, t secon

Lisa [10]

Answer:

2.62 seconds

Step-by-step explanation:

Let

t ----> the time in seconds

h(t) ----> he height of the ball, in feet

we have

$h(t)=-16t^2+40t+5$

we know that

When the ball hits the ground, the height is equal to zero

$-16t^2+40t+5=0$

The formula to solve a quadratic equation of the form

$at^{2} +bt+c=0$

is equal to

$t=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$-16t^2+40t+5=0$

$a=-16\\b=40\\c=5$

substitute in the formula

$t=\frac{-40\pm\sqrt{40^{2}-4(-16)(5)}} {2(-16)}$

$t=\frac{-40\pm\sqrt{1,920}} {-32}$

$t=\frac{-40+\sqrt{1,920}} {-32}=-0.12\ sec$

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therefore

The solution is t=2.62 seconds

4 0

3 years ago

What is standard form?

Katen [24]

Hey there! :)

When teachers ask you for the standard form in math, they are asking you to find the simplest form an equation with variables can be in.

Ax + By = C

Example : put y=2x -3 into standard form.

Subtract 2x from both sides.

-2x + y = -3 —> standard form.

Hope this helped! :)

7 0

3 years ago

Read 2 more answers

-2(x + y)2 for for x =-3, y = 2 with steps

svlad2 [7]

Step-by-step explanation:

-2(-3+2)2

(-2×-3)+(-2×2)2

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2(6-4)

(2×6)+(2×-4)

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6 0

3 years ago

Greatest to least <br> 5,-12/16,9/36,-23/35

Ksenya-84 [330]

Answer:

5, 9/36, -12/16, -23/35

Explanation:

Convert to decimals then rearrange.

6 0

3 years ago