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Darina [25.2K]
3 years ago
14

Emily has the following grades in his math class: Homework grades: 80, 100, 90, Quiz grades: 84, 90, 72, Test grades: 64,

Mathematics
1 answer:
Bess [88]3 years ago
8 0

Answer:

75

Step-by-step explanation:

Homework mean x 10%: (80+100+90)/3 x 0.1 = 90 x 0.1 = 9

Quiz mean x 25%: (84+90+72)/3 x 0.25 = 20.5

Test mean x 45%: (64+72)/2 x 0.45 = 30.6

Sum of means/percentage of grade: 9 + 20.5 + 30.6 = 60.1/.8 = 75.125

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What is the y value of the vertex of the function f(x)=-(x-3)(x+11)
AnnyKZ [126]

Answer:

49

Step-by-step explanation:

Because there is a minus sign infront of x-3, we can convert x-3 into the negative form:

- * x

- * -3

-x + 3

Which gives us:

(-x + 3)(x + 11)

Now expand the brackets with the formula:

(a + b)(c + d) = ac + ad + bc + bd

-x * x = -x²

-x * 11 = -11x

3 * x = 3x

3 * 11 = 33

-x² - 11x + 3x + 33

-x² - 8x + 33

The formula for finding the x coordinate of a vertex in a quadratic equation is:

x = \frac{-b}{2a}

Plug known variables in:

x = \frac{-(-8)}{2(-1)}

x = \frac{8}{-2}

x = -4

Now, to find the y coordinate, plug this variable back into the quadratic equation:

-x² - 8x + 33

y = -(-4^2) - (32) + 33\\y = -16 + 32 + 33\\\\

y = 49

So the y coordinate of the vertex is 49.

Hope this helps!

4 0
3 years ago
Maggs invests $10,250 at a rate of 9%, compounded weekly. To the nearest whole dollar, find the value of the investment after 7
Setler79 [48]
Number of weeks in a year: 52
Weeks in 7 years: 52 x 7 = 364 

Final amount = Initial amount x (1 + interest)^(time period)

Final amount = 10,250 x (1.09)³⁶⁴
Final amount = $4.3 x 10¹⁷
6 0
3 years ago
Read 2 more answers
Choose the answer : which is the equation of the given line in slope-intercept form
Julli [10]
The answer is b y=-3x-1
5 0
3 years ago
Read 2 more answers
A road map of the state of Texas has a scale of 0.5 miles in =50 miles. If the distance between two points in the state is 600 m
tamaranim1 [39]

Answer:

6 miles

Step-by-step explanation:

Let's set up a ratio:

\frac{0.5}{50}=\frac{x}{600}

We can use "cross multiplication" to solve for x

Cross multiplication is multiplying the numerator of the first fraction by the denominator of the second fraction and the denominator of the first fraction by the numerator of the second fraction.

0.5*600=50x

300=50x

Divide both sides by 50 to isolate x

x=6

8 0
2 years ago
Please help you guys, Look at the picture attached
Nookie1986 [14]

Answer:

Step-by-step explanation:

if (x,y) is the centroid. Then x=(x1+x2+x3)/3,y=(y1+y2+y3)/3

5.

x=(-2+4+10)/3=4

y=(6+0+6)/3=4

centroid=(4,4)

6.

x=(3+5-2)/3=2

y=(3-1+1)/3=1

centroid=(2,1)

8 0
3 years ago
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