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2 years ago

Hey Guys, having trouble on this problem, can you help me?Click on the Picture for full view

Mathematics

1 answer:

just olya [345]2 years ago

8 0

Are you serious? This is addition and subtraction.

If she has $45 dollars to spend...
17+8+4=29. <------ This is the total of dollars she spent (admission, clothing, etc.)
$45-$29= $16 (This is what she has left)
For a positive expression just do
10+6=16 Boom! Done.

2nd problem)
She has $16 dollars left. The shirt is $19. NO she cannot buy the shirt because 16-19 is -3. You can't do $45, and start over because she already spent her money. Therefore, No she cannot.

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Help!! 50 points and brainliest!

Viktor [21]

Answer:

Second choice:

$x=2t$

$y=4t^2+4t-3$

Fifth choice:

$x=t+1$

$y=t^2+4t$

Step-by-step explanation:

Let's look at choice 1.

$x=t+1$

$y=t^2+2t$

I'm going to subtract 1 on both sides for the first equation giving me $x-1=t$ . I will replace the $t$ in the second equation with this substitution from equation 1.

$y=(x-1)^2+2(x-1)$

Expand using the distributive property and the identity $(u+v)^2=u^2+2uv+v^2$ :

$y=(x^2-2x+1)+(2x-2)$

$y=x^2+(-2x+2x)+(1-2)$

$y=x^2+0+-1$

$y=x^2$

So this not the desired result.

Let's look at choice 2.

$x=2t$

$y=4t^2+4t-3$

Solve the first equation for $t$ by dividing both sides by 2:

$t=\frac{x}{2}$ .

Let's plug this into equation 2:

$y=4(\frac{x}{2})^2+4(\frac{x}{2})-3$

$y=4(\frac{x^2}{4})+2x-3$

$y=x^2+2x-3$

This is the desired result.

Choice 3:

$x=t-3$

$y=t^2+2t$

Solve the first equation for $t$ by adding 3 on both sides:

$x+3=t$ .

Plug into second equation:

$y=(x+3)^2+2(x+3)$

Expanding using the distributive property and the earlier identity mentioned to expand the binomial square:

$y=(x^2+6x+9)+(2x+6)$

$y=(x^2)+(6x+2x)+(9+6)$

$y=x^2+8x+15$

Not the desired result.

Choice 4:

$x=t^2$

$y=2t-3$

I'm going to solve the bottom equation for $t$ since I don't want to deal with square roots.

Add 3 on both sides:

$y+3=2t$

Divide both sides by 2:

$\frac{y+3}{2}=t$

Plug into equation 1:

$x=(\frac{y+3}{2})^2$

This is not the desired result because the $y$ variable will be squared now instead of the $x$ variable.

Choice 5:

$x=t+1$

$y=t^2+4t$

Solve the first equation for $t$ by subtracting 1 on both sides:

$x-1=t$ .

Plug into equation 2:

$y=(x-1)^2+4(x-1)$

Distribute and use the binomial square identity used earlier:

$y=(x^2-2x+1)+(4x-4)$

$y=(x^2)+(-2x+4x)+(1-4)$

$y=x^2+2x+-3$

$y=x^2+2x-3$ .

This is the desired result.

3 0

3 years ago

Read 2 more answers

Question options: (1, 4.5) (2, 1.5) (1.5,2) (6,4)

sweet [91]

Answer:

(1.5,2)

Step-by-step explanation:Its the only one furthest away from the rest

4 0

3 years ago

BRAINLIESTT

Rudik [331]

9514 1404 393

Answer:

3 months

Step-by-step explanation:

We don't know what's on your list of "useful financial formulas." One that can be used here is the formula for simple interest:

I = Prt . . . . . interest on principal P at annual rate r for t years

Solving for t gives ...

t = I/(Pr)

Filling in the given values, we can find t to be ...

t = 138/(4800×0.115) = 138/552 = 1/4

1/4 year is 3 months -- the duration of the loan.

4 0

2 years ago

What is the greatest common factor of 4-6a

strojnjashka [21]

Answer:

The GFC of 5 and 6 is 2.

Step-by-step explanation:

Hope this helps :))

8 0

2 years ago

c) Ron spends 30% of each week asleep. How many hours is this? Give your answer to the nearest hour.

Troyanec [42]

Answer:

1week=7days

7days=30%

1day=24hrs

24×7=168hours

168=100% about 30%

168×30÷100=50.4hours

6 0

1 year ago