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2 years ago

7

If Selena completes her homework with 100 percent accuracy, she's allowed

2 answers:

KATRIN_1 [288]2 years ago

4 0

Answer:

she can watch 2.5 hours of her show

Step-by-step explanation:

FrozenT [24]2 years ago

3 0

Answer:

750

Step-by-step explanation:

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Ten times the sum of negative four and a number. Write as an Algebraic expression then simplify

Tju [1.3M]

Answer:

10x(-4+a)

explanation

4 0

3 years ago

Write a quadratic function, in standard form, that fits the set of points. Solve it as a system of three equations. (-4, 9), (0,

Tresset [83]

Answer:

$\boxed{y=2x^2+4x-7}$

Step-by-step explanation:

Let the quadratic function be

$y=ax^2+bx+c$

We substitute $(-4,9)$ into the equation to obtain;

$9=a(-4)^2+b(-4)+c$

$\Rightarrow 9=16a-4b+c---(1)$

We substitute $(0,-7)$ to obtain;

$-7=a(0)^2+b(0)^2+c$

$\Rightarrow c=-7---(2)$

We finally substitute $(1,-1)$ to obtain;

$-1=a(1)^2+b(1)^2+c$

$\Rightarrow -1=a+b+c---(3)$

We put equation (2) into equation (1) to get;

$9=16a-4b-7$

$16a-4b=16$

$\Rightarrow 4a-b=4---(4)$

$\Rightarrow -1=a+b-7$

$\Rightarrow a+b=6---(5)$

We add equation (4) and (5) to get;

$4a+a=6+4$

$\Rightarrow 5a=10$

$\Rightarrow a=2$

We put $a=2$ into equation (5) to get;

$2+b=6$

$\Rightarrow b=6-2$

$\Rightarrow b=4$

The reqiured quadratic function is

$y=2x^2+4x-7$

7 0

2 years ago

HELP TAKING MY EXAM!!! What are the factors of 2x2 + 3x - 54? Select two options.

Stels [109]

Answer:

2x^2 + 3x – 54 = (2x - 9) (x + 6), so A and F

Step-by-step explanation:

7 0

3 years ago

4x + 8y=20<br> 3x+6y=15<br> solve this system of equations

laila [671]

4x=20-8y

x=5-2y now use this value of x in the second equation...

3(5-2y)+6y=15

15-6y+6y=15

15=15 This is true for any y or x value.

So there are infinitely many solutions as the two equations describe the same line.

5 0

3 years ago

Read 2 more answers

joshua is 6 years younger than kerryn. Kerryn age can be represented by x.write an expression representing joshua's age.

never [62]

Answer: X - 6

If you were to write an equation you can use Y to represent Joshua's age, X - 6 = Y

3 0

3 years ago