3 years ago

Change the subject of the formular to R

Mathematics

1 answer:

Dmitrij [34]3 years ago

5 0

Answer:

r=s-t ÷ 2

Step-by-step explanation:

r2=s-t

r2÷2= s-t ÷2

r=s-t ÷2

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What is expression equivalent to 23x

Anvisha [2.4K]

Answer:

23X

Step-by-step explanation:

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3 years ago

Which would be the best method to use to solve the following equations? Explain your reasoning.

o-na [289]

A. square root property

$3x^2-192=0\\x^2-66=0\\x^2=66\\x= -\sqrt{66} or \sqrt{66}$

it has one value with x which is x^2 and it cn be easily solved without having to factorise, quadratic formula cant be used as it need ax^2+bx+c=0 format

B. factorising

$x^2-x-6=0\\x^2+2x-3x-6=0\\(x+2)(x-3)=0\\x+2=0 and x-3=0\\x= -2 \\x= 3$

i just felt like this was easier to factorise than the other 2 options left

C. Completing the square

$x^2-6x-7=0\\(x-3)^2=0\\x= -1\\x= 7$

same reason personal preference

D- Quadratic

$x^2-17x-7=0\\x=\frac{-(-17)+\sqrt{(-17)^2-4(1)(-7)} }{2(1)} \\x=\frac{-(-17)-\sqrt{(-17)^2-4(1)(-7)} }{2(1)}\\x=17.4\\x=-0.402$

the 17 kinda threw me off and i didnt wanna get on factorising or doing completing the square so quadratic formal

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2 years ago

If you need to construct a dog run for your dog and the total perimeter needs to be 40 feet, and you only have enough room to ma

Natali [406]

Answer:

15 feet

Step-by-step explanation:

if the dog run is a rectangles then the formula for the perimeter is 2h+2l

if we plug in the numbers we know we get this:

2h+2(5)=40

2h+10=40

2h=30

h=15

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2 years ago

On Monday, 288 students went on a trip to the zoo. All 7 buses were filled and 8 students had to travel in cars. How many studen

olchik [2.2K]

Answer:

40 kids

Step-by-step explanation:

288 minus the 8 kids that had to hide in cars= 280. 280 divided by the seven busses is 40

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2 years ago

The Lamaster family is a family of five people. They have used 4,885.78 gallons of water so far this month. They cannot exceed 7

oksian1 [2.3K]

Let X be the amount of water one person can use.

Multiply that by 5 people to get 5X

That amount plus what they already used ( 4885.78) needs to be less than or equal to the amount they are limited to ( 7250.50 ).

Now write out the equation to get : 5x + 4885.78 ≤ 7250.50

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3 years ago