What is the best estimate for the product of 289 and 7
Answers
Then I would subtract (11 x 7) + 77 from that to get the exact answer of 2023
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I didn't use a calculator or paper. The 'trick' is to notice that 289 = (300 - 11)
289, rounded up is 290, then seperate the number, (200 + 90)
200 X 7 = 1400 (multiply the numeral, then add the zeros)
90 X 7 = 630 (repeat the same process)
1400 + 630 = 2030 (actual answer = 2023)
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What is the inverse of the function f(x)=-x?
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Rewrite the equation by completing the square. 4 x^{2} +20 x +25 = 04x 2 +20x+25=0
b) How much nickel is needed to mix with 20kg of copper?
Answers
a) How much copper needed for 20 kg nickel
C:N = 4: 1
C:20 = 4:1
C/20 = 4/1 Cross Multiply
C*1 = 4*20
C = 80
80kg Copper would be needed.
b) How much Nickel would be needed for 20 kg of Copper
C:N = 4: 1
20:N = 4:1
20/N = 4/1 Cross Multiply
4*N = 1*20
4N = 20 Divide both sides by N.
N = 20/4 = 5
5kg Nickel would be needed.
Answers
fraction form. Then write the fraction as a repeating
decimal.
Answers
=1/3
=0+1/3
=0=0.3
Remember: Put a notation bar (or line) above the top of the number 3. This means it repeats continuously as a decimal.
=
Hope this helps!
Note that even though it's uneven, just think of it as a line on top of 3 in (0.3). :)
Answers
First you had to divide fifty-eight by the six.
You can also round up to the nearest tenths is 9.67=10.00.
Explanation: The answer should be have a remainder 4 it is.
Final answer:
Hope this helps!
And thank you for posting your question at here on brainly, and have a great day.
-Charlie
the answer would be
58÷ 6 = 9.66666666667
we can round it to 9.67
hope it's helpfull
Answers
Answer:
x = {120°, 240°}
Step-by-step explanation:
cos x = -1/2 for 0 ≤ x ≤ 360°
That cosine of x = -1/2 tells us two things immediately: 1) the hypotenuse has length 2 and the side adjacent to the angle x is -1. To have a negative adjacent side, angle x must be in either Quadrant II or Quadrant III.
If in Quadrant II, the terminal side of angle x is 30° past 90°, which means that x = 120°. If in Quadrant III, the terminal side of x is 30° short of 270°, which means that x = 240°
Then x = {120°, 240°}