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Step2247 [10]
2 years ago
13

The number of cases of a new disease can be modeled by the quadratic regression equation y = -2x^2 + 40x + 8. What is the best p

rediction for the number of cases in year 15
Mathematics
1 answer:
Stels [109]2 years ago
5 0

Answer:

158 cases

Step-by-step explanation:

Given tbe quadratic regression model :

y = -2x^2 + 40x + 8

y = number of cases of a new disease

x = number of years

The predicted number of cases of a new disease in 15 years can be calculated thus ;

Put x = 15 in the equation ;

y = -2(15)^2 + 40(15) + 8

y = - 2 * 225 + 600 + 8

y = - 450 + 600 + 8

y = 158

158 cases

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Mhanifa please help! Explain how you can use the perpendicular bisector of a segment to draw an isosceles triangle.
Anna007 [38]

Answer:

If you construct the perpendicular bisector of a line segment, every point on the perpendicular bisector will be the same distance from both point A and point B.

To construct an isosceles triangle, you can start from any point on the perpendicular bisector and draw line segments to point A and to point B

7 0
2 years ago
José collects stamps. He has 7 used stamps for every 4 new stamps. If he has 28 new stamps, how many used stamps does he have?
jenyasd209 [6]

Answer:

José has 49 used stamps

Step-by-step explanation:

7 used stamps for every 4 new stamps

To solve this type of problem, we can use a ratio

7 : 4 ratio

He has 28 new stamps

7 : 4 = x : 28

Ratios can be written as fractions

\frac{7}{4} = \frac{x}{28}

Cross multiply

4x = 7(28) = 196

Divide by 4 on both sides

x = 49

Hope this helps :)

3 0
3 years ago
Express 9 as a ratio of 27​
ANTONII [103]

Answer:

9/27 or 9 to 27

Step-by-step explanation:

7 0
2 years ago
Read 2 more answers
Find the number of sides of a regular polygon if the sum of its interior angle is 1440
scoundrel [369]
The formula is 180(n-2)= 1140 then you divide 1140 by 180 to get 8 so then it would like like n-2=8 add the 2 over and n (being the number of sides)= 10 so your answer will be 10
8 0
3 years ago
Hyla has blocks of clay that are each 4 centimeters by 4 centimeters by 2 centimeters. She needs to cover the bottom of a box wi
LenaWriter [7]

The number of blocks of clay needed by Hyla is 30 blocks

<h3>What is area?</h3>

Area is the region bounded by a plane shape.

To calculate the number of blocks of clay needed by Hyla, we find the area of the bottom of the box and divide it by the area of the block.

Formula:

  • n = LWH/lwh............... Equation 1

Where:

  • n = Number of blocks of clay needed by Hyla
  • L = Length of the bottom of the box
  • W = Width of the bottom of the box
  • H = Height of the box
  • l = Length of the bottom of the block
  • w = Width of the block
  • h = Height of the block.

From the question,

Given:

  • L = 24 cm
  • W = 20 cm
  • H = 2 cm
  • l = 4 cm
  • w = 4 cm
  • h = 2cm

Substitute these values into equation 1

  • n = (24×20×2)/(4×4×2)
  • n = 30

Hence, The number of blocks of clay needed by Hyla is 30 blocks

Learn more about area here: brainly.com/question/2217700

#SPJ1

7 0
1 year ago
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