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jeka94
3 years ago
15

What other compatible numbers could you use for 428 and 286

Mathematics
1 answer:
kaheart [24]3 years ago
4 0
How about raising 286 up by 14 to 300 and compensating by lowering 428 by the same 14 Since I know that 14 + 14 is 28  then 28-14 is 14
So 428 - 14 = 414
So now I have 414 + 300 which I can do mentally - the answer is 714 and is also the answer to the original problem 428 + 286

Compensation works very well - bring one number up or down to a rounded number and compensate by doing the opposite to the other  - instead of 199 + 457 - try 200 + 456
Same answer and because one of the numbers is nicely rounded, it is easy to add the other. 

One more:  207 + 182  becomes 200 + 189 =389   I lowered one by 7 and raised the other one by the same 7.

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Rewrite the following equation in slope-intercept form.<br><br> 3x − 11y = 19
Law Incorporation [45]

Answer:

y = 3/11(x) - 19/11

Step-by-step explanation:

Step 1: Subtract 3x from both sides.

  • 3x-11y-3x=19-3x
  • -11y=-3x+19

Step 2: Divide both sides by -11.

  • -11y/-11=(-3x+19)/-11
  • y=\frac{3}{11}x-\frac{19}{11}

Therefore, the answer is y = 3/11(x) - 19/11.

8 0
3 years ago
A circle has a radius of 11 in. Find the length s of the arc intercepted by a central angle of 11°.
Travka [436]

Answer:

Step-by-step explanation:

11 degrees to radians: 1 degree =57.296 radians

L = (11 degrees)/(57.296) x (11 in) = 2.111848 in

7 0
3 years ago
A digital picture is made up of many small dots called pixels. Rayma has a picture that is 40 pixels wide and wants to enlarge i
Xelga [282]
The answer to your question is w =40(2)n [n is in exponent form I just couldn’t type it that way ]
4 0
3 years ago
The city carnival is holding a raffle. Every raffle ticket purchased will go into a large bin. At the end of the day, one ticket
rodikova [14]

Answer:

D 1/25

Step-by-step explanation:

6+8= 14

14/350 = 0.04

1/25= 0.04

3 0
3 years ago
Read 2 more answers
A ball is thrown from an initial height of 2 feet with an initial upward velocity of 31 ft/s. The ball's height h (in feet) afte
Vlad1618 [11]

A quadratic equation is in the form of ax²+bx+c. The time at which the height of the ball is 16 feets is 0.717 seconds and 1.221 seconds.

<h3>What is a quadratic equation?</h3>

A quadratic equation is an equation whose leading coefficient is of second degree also the equation has only one unknown while it has 3 unknown numbers. It is written in the form of ax²+bx+c.

The complete question is:

A ball is thrown from an initial height of 2 feet with an initial upward velocity of 31 ft/s. The ball's height h (in feet) after 7 seconds is given by the following, h=2+31t-16t². Find all values of t for which the ball's height is  16 feet. Round your answer(s) to the nearest hundredth.

The time at which the height of the ball is 16 feet can be found by,

h = 2 + 31t - 16t²

16 = 2 + 31t - 16t²

16 - 2 - 31t + 16t² = 0

16t² - 31t + 14 = 0

t = \dfrac{-(-31)\pm \sqrt{(-31)^2-4(16)(14)}}{2(16)}\\\\

t = 0.717 , 1.221

Hence, the time at which the height of the ball is 16 feets is 0.717 seconds and 1.221 seconds.

Learn more about Quadratic Equations:

brainly.com/question/2263981

#SPJ1

4 0
2 years ago
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