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balandron [24]
3 years ago
13

Help 30 points and i will mark brainliest for the best answer which will be more points

Mathematics
1 answer:
klasskru [66]3 years ago
6 0

Answer:

See below

Step-by-step explanation:

From the table we see there is a relation between x and y values

Every step change of x = 0.5, every step change of y = 2

<u>This relation is linear. The formula for linear function is:</u>

  • y = mx + b

<u>Using to pairs of points to get the slope and y-intercept</u>

  • (0, 60) and (1, 64)

<u>Calculating the slope:</u>

  • m = (64 - 60)/(1 - 0) = 4/1 = 4
  • y - intercept is 60 as per point (0, 60)

<u>So the function is</u>

  • y = 4x + 60
<h3>Part A</h3>
  • Yes. Described above
<h3>Part B</h3>
  • y = 4x + 60
<h3>Part C</h3>
  • Slope is the steepness of the line.
  • y -intercept is the lowest score with no time spent studying
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A rectangle with dimensions of 3 units by 7 units is enlarged by a scale factor of 1.1. By what percent does it’s area increase?
Ratling [72]

Answer:

21\%

Step-by-step explanation:

Original dimensions of the rectangle

l=7\ \text{units}

w=3\ \text{units}

Area of the rectangle

A=7\times 3=21\ \text{units}^2

Scale factor = 1.1

New dimensions

l'=7\times 1.1=7.7\ \text{units}

w'=3\times 1.1=3.3\ \text{units}

The new area of the rectangle

A'=7.7\times 3.3=25.41\ \text{units}^2

Percentage change is given by

\dfrac{A'-A}{A}\times 100\\ =\dfrac{25.41-21}{21}\times 100=21\%

The percentage by which the area of the rectangle increases is 21\%.

8 0
3 years ago
Chris buys copies of Sunday's newspaper for $1.50 each. He plans to sell them for $2.20 each. What is the approximate percent in
Igoryamba

Answer:

47 %

Step-by-step explanation:

from 1.50 to 2.20 there's a 46.67 increase. to the nearest whole number that's 47%

percent increase formula

% increase = 100 x (final - initial) / absolute value of initial

8 0
3 years ago
The vertices of a triangle are A (2,5) B (1,2) and C (3,1) . Find the coordinates of the image after a dilation with respect to
telo118 [61]

K=2

  • A'=2(2.5)=(4,10)
  • B'=2(1,2)=(2,4)
  • C'=2(3,1)=(6,2)

Translation of 2 units left means change in x

  • A''=(4-2,10)=(2,10)
  • B"=(2-2,4)=(0,4)
  • C"=(6-2,2)=(4,2)

Translation of 1 units up means change in y

  • A'''=(2,10+1)=(2,11)
  • B'''=(0,4+1)=(0,5)
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5 0
2 years ago
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Please I need help.<br> Find the sum of the interior angles of the figure below.
FrozenT [24]
Ok so to find the sum of interior angles the formula is

s=180(n-2)
s is sum and n is the number of sides

so this is a quadrilateral cause it has 4 sides

because of that n=4

substitute

s=180(4-2)

now you can either distribute or do pemdas but its easier and more efficient to just do pemdas

s=180(2)
s=360 degrees
5 0
3 years ago
What is the circumference of a circle with a radius of 2.5 meters?
Hitman42 [59]

Answer:

15.71m

Step-by-step explanation:

circumference of a circle = 2πr

where r = 2.5m

where π = 3.142

we have,

2*3.142*2.5 = 15.71m

therefore the circumference of a circle with a radius 2.5m = 15.71 m

8 0
4 years ago
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