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labwork [276]
3 years ago
8

Youll be marked as brainliest:)

Mathematics
2 answers:
kotykmax [81]3 years ago
4 0

Answer:

-5

Step-by-step explanation:

\frac{3}{5}y+7=3-\frac{1}{5}y\\\bigg(\frac{3}{5}+\frac{1}{5}\bigg)=3-7=-4\\\frac{4}{5}y=-4\\y=-5

aksik [14]3 years ago
3 0
Y = -5 is the answer . With questions like these just use Photomath ! They show you step by step
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Trigonometric identities Simplify cos^2 theta -1/ 4 sin^2 theta
Veronika [31]

Answer:

B

Step-by-step explanation:

using the identity

sin²x + cos²x = 1 ( subtract 1 from both sides )

sin²x + cos²x - 1 = 0 ( subtract sin²x from both sides )

cos²x - 1 = - sin²x

then

\frac{cos^20-1}{4sin^20}

= \frac{-sin^20}{4sin^20} ← cancel sin²Θ on numerator and denominator

= \frac{-1}{4}

= - \frac{1}{4}

4 0
2 years ago
ill give brainliest!! Solve these equations for the variable. Check your solutions. please put the answers to this
natima [27]

Answer:

I have done one question for you

hope it helps

plz Mark as brainlist

4 0
3 years ago
It has been decided that 100 people need to be surveyed to decide the publics opinion on a school building project. A student su
Morgarella [4.7K]

Answer:

The proposed way of sampling is a biased way to perform the survey.

Step-by-step explanation:

Convenience sampling is a kind of non-probability sampling method that comprises of the sample being taken from that portion of the population that is near to hand.  In this type of sampling method, all items doesn’t have an equivalent chance of being selected, which doesn’t comprises of random collection of items.

Convenience sampling is where we take in items which are easy to reach.

Convenience sampling consists of selection bias, i.e.e the bias involved in the sample due to inappropriate selection procedures.

For example, randomly selecting 4 people sitting near him to guesstimate the mean age of the class is a convenience sampling example. or gathering information on customer satisfaction by interviewing 6 randomly selected customers from a local store is an illustration of convenience sampling.

In this case, the sample suggested by the students consists of surveying the first 100 people who enter the school, about the public opinion on a school building project.

This is an example of convenience sample.

So, there is a selection bias present in the sample.

Thus, the proposed way of sampling is a biased way to perform the survey.

4 0
4 years ago
Find the inverse of the function f(x) = 2x – 4.
otez555 [7]
<span>f(x) = 2x – 4
</span><span>inverse
x = 2y - 4
2y = x + 4
  y = x/2 + 2

answer
inverse
f-1(x) = </span>x/2 + 2
6 0
3 years ago
Read 2 more answers
There are 750 people at a football game. Out of this number, 320 are students. What percent of the people at the football game a
zlopas [31]

Answer:

I have no clue

Step-by-step explanation:

i dont lnow

6 0
3 years ago
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