3 years ago

How to solve PLS HELP

Mathematics

1 answer:

topjm [15]3 years ago

3 0

Answer is x=-3
Explanation:
-2x+1=7
X=-3

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Two middle school classes take a vote on the destination for a class trip. Class A has 25 students, 56% of whom voted to go to S

Kryger [21]

Answer:

The value of n is 15.

Step-by-step explanation:

The combined proportion is computed using the formula:

$P=\frac{n_{A}\cdot p_{A}+n_{B}\cdot p_{B}}{n_{A}+n_{B}}$

The information provided is as follows:

$n_{A}=25\\p_{A}=0.56\\n_{B}=n\\p_{B}=0.60\\P=0.575$

Compute the value of n as follows:

$P=\frac{n_{A}\cdot p_{A}+n_{B}\cdot p_{B}}{n_{A}+n_{B}}$

$0.575=\frac{25\times 0.56+n\times 0.60}{25+n}\\\\0.575(25+n)=14+0.60n\\\\14.375+0.575n=14+0.60n\\\\0.60n-0.575n=14.375-14\\\\0.025n=0.375\\\\n=15$

Thus, the value of n is 15.

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3 years ago

When constructing a polygon how can you be sure

ikadub [295]

Make sure it has eight sides

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3 years ago

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A shopkeeper marks the price on articles 25% above the cost price. After allowing 10% discount, it was sold at gain of Rs 150. F

SashulF [63]

Answer: $Rs. 166.67$

Step-by-step explanation:

Given

Mark up price is 25% higher than cost price

The shopkeeper gives a discount of 10%

Suppose the cost price is $x$

Mark up price is $1.25x$

Selling price is

$\Rightarrow 1.25x\times 0.9=1.125x$

It is given Rs150

$\therefore 150=1.125x\\\Rightarrow x=\text{Rs}133.33$

Marked up price is $\text{Rs }166.67$

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3 years ago

Radius of a circle whose diameter is d=7.2

TiliK225 [7]

ANSWER:3.6

EXPLAINATION:
since a diameter is the total length from one side to the other and a radius is just to the middle of a circle. to get the diameter yoo would have to divide 7.2÷2=3.6
IF YOU LIKE MY ANSWER I WOULD APPRECIATE A BRAINLIEST. THANK YOU

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3 years ago

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Jackson Middle School has 6 students in choir for every 1 student in band. If there are 52 students in band, how many students a

posledela

Answer:

There are 312 students in choir

Step-by-step explanation:

If there are 52 students in band and for every 1 student in the band, 6 are in choir

Therefore, 52 × 6 = 312

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3 years ago

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