MATHEMATICS HIGH SCHOOL

Using the quadratic formula to solve 4x^2 – 3x + 9 = 2x + 1, what are the values of x?A: 1+-sqrt159i/8
B: 5+-sqrt153i/8
C: 5+-sqrt103i/8
D: 1+-sqrt153i/8

Answers

Answer 1
Answer: 4x^2-3x+9=2x+1 \n4x^2-3x-2x+9-1=0 \n4x^2-5x+8=0 \n \na=4 \n b=-5 \n c=8 \n b^2-4ac=(-5)^2 - 4 * 4 * 8=25-128=-103 \n \nx=(-b \pm √(b^2-4ac))/(2a)=(-(-5) \pm √(-103))/(2 * 4)=\boxed{(5 \pm √(103)i)/(8)}

The answer is C.

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The measurement of one angle of a right triangle is 42°. What is the measurement of the missing angle?

Answers

All triangles have 3 angles that add up to 180 degrees.
All right angle triangles have a 90 degree angle.
You have two angles, 90 and 42.
To find the last one, add 90 and 42. Then subtract that from 180 degrees.

90+42=132
180-132=48

        Therefore, the missing angle is 48 degrees.

Answer:

48°

Explanation:

42 + 90 = 132

because all triangle angles add up to 180°, then:

180 - 132 = 48°

Joe wants to purchase a new skateboard. He already has $40 and can save $20 each week from his job. Write a linear equation to represent the total amount he has after ‘w’ weeks.A) T = 20 + 40w

B) T = 60w

C) T = 40 + 20 + w

D) T = 40 + 20w

Answers

Answer:

D

Step-by-step explanation:

Joe already has $40 and can save $20 each week. the total amount he can save in a given number of weeks is $20 multiplied by the that number of weeks which in this case is w so 20w. To find the total T of the amount he has after w weeks, you add the amount he already has to the amount saved. So the equation would be T=40+20w

Answer:

D) T = 40 + 20w

Step-by-step explanation:

Trust me! i had this on my test/ exam, and it was correct!!

i really hoped this helped! Have a wonderful day!

How far will the feather have fallen if it reaches the surface in 9.00 seconds? Given: g on moon = -1.63 meters/second2

Answers

-1.63 times 9.00 = -6.57 meters in 9.00 seconds

if the computer screen shows this image as calinda is downloading a file, how big is the file she’s loading ?

Answers

Answer:

the file is 20 kb

Step-by-step explanation:

16kb/80%

xkb/100%

1600=80%

80       80

20KB

7x-4x+12=36-5y please show steps

Answers

7x-4x+12=36-5y
move x and y to one side.
7x-4x+5y=36-12
3x+5y=24
HOPE I HELPED!!!
Check the attachment below.

A wheel has a radius of 15 cm. Approximately how far does it travel in 4 revolutions?47.1 cm


94.2 cm


188.4 cm


376.8 cm

Answers

Radius is 15 cm
Circumference = 2 pi r
C = 2 x 3.14 x 15cm
C = 94.2 cm
94.2 cm x 4 (revolutions) = 376.8 = D
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