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N76 [4]
3 years ago
14

Match the expressions with their simplified versions.

Mathematics
2 answers:
oee [108]3 years ago
8 0

Answer are in order from top to bottom

1. 8

2. square of 7

3. 1/2

4. 20

Alenkasestr [34]3 years ago
3 0

Answer:

Step-by-step explanation:

1. 4\sqrt{2}*\sqrt{2} = 4*\sqrt{2}^{2}=4*2=8

2.3\sqrt{7} -2\sqrt{7} =(3-2) \sqrt{7} = 1*\sqrt{7} =\sqrt{7}

3.\frac{\sqrt{7} }{2\sqrt{7} } =\frac{1}{2}

4.2\sqrt{5} *2\sqrt{5} =2*2*\sqrt{5} *\sqrt{5}=4*5=20

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A hovercraft takes off from a platform. Its height (in meters), xxx seconds after takeoff, is modeled by: h(x)=-2x^2+20x+48h(x)=
Ad libitum [116K]

the maximum height is the y-value of the vertex.

h(x) = -2x² + 20x + 48

      <em>  a=-2, b=20, c=48</em>

x = \frac{-b}{2a} = \frac{-20}{2(-2)} = \frac{-20}{-4} = 5

h(5) = -2(5)² + 20(5) + 48

      =  -50   +  100   + 48

      =          50         + 48

      =                98

Answer: 98 meters

8 0
3 years ago
Every Wednesday, Carla runs 2.5 miles. How many feet did she run?
Inessa05 [86]

Answer:

13,200 feet

Step-by-step explanation:

There are 5280 feet in a mile, so multiply 5280 by 2.5

5280*2.5=13,200

So, every Wednesday, she runs 13,200 feet

Hope this helps! :)

7 0
3 years ago
the vertex of a triangle is located at (-2,3). it is rotated 90 degrees clockwise about the origin. what is the new y- coordinat
irina1246 [14]

Answer:

90° clockwise rotation rule (about the origin)  for a point

Step-by-step explanation:

(x , y)  →   (y, -x)

Swap x and y......change the  sign on x

Can you take it  from here   ???

5 0
2 years ago
You randomly draw a marble from a bag, record its color, and then replace it. You draw a red marble 3 out of 20 times. What is t
liraira [26]

Fraction: 9/100

Decimal: 0.09

Percentage: 9%

4 0
3 years ago
Which line has an equation of y=-5x+4 in slope-intercept form?
tino4ka555 [31]

You can figure the line for each pair of points, or you can try the points in the equation you have and see which are on the line.


First answer: x=1, y=-5×1 +4 = -1 . . . not 9. (1, 9) is not a point on the line


Second answer: x=2, y=-5×2 +4 = -6 . . . not -14. (2, 14) is not a point on the line


Third answer: (see the calculation for the first answer) . . . -1 ≠ 1. (1, 1) is not a point on the line


Fourth answer: (see the calculation for the second answer) We know that (2, -6) is on the given line. Checking (4, -16), we find it is as well.



The appropriate choice is the 4th answer:

... a line passing through the points (2, -6) and (4, -16)

4 0
3 years ago
Read 2 more answers
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