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Natasha2012 [34]
2 years ago
9

CAN SOMEONE PLEASE HELP

Mathematics
1 answer:
daser333 [38]2 years ago
8 0

Answer:

D

Step-by-step explanation:

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If 86 is added to a number the result is 56 less than twice the number, find the exact number, Do not round!
vredina [299]
The number is 142
you first make an equation ;
86+x=2x-56
Add 56 to both sides
142+x=2x
Subtract x from both sides
142=x
7 0
3 years ago
Need help solving this
DedPeter [7]

Answer:

  x = (√21)/2

Step-by-step explanation:

The sides of a 30°-60°-90° triangle have the ratios 1 : √3 : 2. That means the middle-length side is (√3)/2 times the length of the longest side.

  x = (√3)/2·√7

  \boxed{x=\dfrac{\sqrt{21}}{2}}

8 0
2 years ago
Solve 2cos^2x + cosx − 1 = 0 for x over the interval [0, 2 π ).
alina1380 [7]
Let cos x = a, then
2a^2 + a - 1 = 0,
solving the quadratic equation, we have:
a = 0.5 or -1.

i.e. cos x = 0.5 or cos x = -1
for cos x = 0.5,
x = pi/3, 2pi - pi/3 = pi/3, 5pi/3

for cos x = -1,
x = pi

therefore, x = pi, pi/3, 5pi/3
Answer: B
6 0
3 years ago
Approximately 4% of silicon wafers produced by a manufacturer have fewer than two large flaws. If Y, the number of flaws per waf
netineya [11]
Well is 56 
Happy for help you

7 0
3 years ago
Giving a test to a group of students, the grades and gender are summarized below
FrozenT [24]

The probability that the student chosen at random is not a male that had a A grade is  0.85.

<h3>What is the probability?</h3>

Probability determines the odds that an event would happen. The probability the event occurs is 1 and the probability that the event does not occur is 0.

The probability = (number of students - males who had a A grade) / total number of students

(59 - 9) / 59 = 50 / 59  = 0.85

To learn more about probability, please check: brainly.com/question/13234031

#SPJ1

3 0
2 years ago
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