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2 years ago

15

I’m like actually failing

2 answers:

astraxan [27]2 years ago

8 0

Answer:

your doing better than I am, I got a 19 on the first test(・_・;)

goldenfox [79]2 years ago

4 0

lol same but I have an actual mental breakdown before I do homework every time

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Find the value of x.<br>A. 90 <br>B. 70 <br>C. 20 <br>D. 50

emmasim [6.3K]

Answer: B. 70

Step-by-step explanation:

i actually can't tell but i think this is right

7 0

3 years ago

Is -2.7 an integer??????????

ale4655 [162]

Answer:

ya you can take it both like integer and decimal

cause - the negative mark make it negative the . make it decimal

3 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

What is the length of a diagonal of a square with a side of 8

zhannawk [14.2K]

diagonal is sqrt of (s^2 x 2)

8^2 = 64

64*2 = 128

sqrt(128) = 11.3137

round answer as needed

3 0

3 years ago

Sin(13pi/2) in periodic function

Nataliya [291]

Answer: 1
13pi/2 can be simplified onto 6 pi/2, so it goes around the unit circle 6 times and left with pi/2. the coordinates of pi/2 is (0,1). the trigonometric function sin is y/r. since r is always 1 on the unit circle, the answer is the y value, in this case it is 1.

5 0

3 years ago