MATHEMATICS MIDDLE SCHOOL

300=400-350(3.2)^(-0.1x)

Answers

Answer 1

Answer:

Answer:

$x=-10\log_(3.2)(2)/(7)$

Step-by-step explanation:

Given the equation $300=400-350\cdot (3.2)^(-0.1x)$

First, subtract 400 from both sides of the equation:

$300-400=400-350\cdot (3.2)^(-0.1x)-400\n \n-100=-350\cdot (3.2)^(-0.1x)$

Multiply the eequation by -1:

$100=350\cdot (3.2)^(-0.1x)$

Divide it by 350:

$(100)/(350)=(3.2)^(-0.1x)\n \n(2)/(7)=(3.2)^(-0.1x)$

This equation is equivalent to the equation

$\log_(3.2)(2)/(7)=\log_(3.2)(3.2)^(-0.1x)\n \n\log_(3.2)(2)/(7)=-0.1x$

Multiply it by -10:

$-10\log_(3.2)(2)/(7)=x$

Hence,

$x=-10\log_(3.2)(2)/(7)$

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Alex is conducting a survey for a car company. She decides to start by interviewing some people in her neighborhood. She prepares a questionnaire and emails it to 50 neighbors who own cars. Of those neighbors, 24 respond. Why is this sample likely to be biased?

Answers

1). Her sample is all from the same socio-economic group ... the people
who live in HER neighborhood.

2). Even from those, she only gets any information from about half of them.

Answer:

Given scenario is :

Alex is conducting a survey for a car company. She decides to start by interviewing some people in her neighborhood.

She prepares a questionnaire and emails it to 50 neighbors who own cars. Of those neighbors, 24 respond.

We can see that Alex sent the questionnaire to only her neighbors or people who live near her, so this will be the reason the sample will be biased.

On a trip, you had to change your money from dollars to British pounds. You got 560 pounds for 800 dollars. How many pounds will you get for 300 dollars?

Answers

Answer

210 pounds

Explanation

First, we are going to find the exchange rate from dollars to pounds.

We know form our problem that 800 dollars are 560 pounds. so:

$(560pounds)/(800dollars) =0.7$ pounds per dollar.

Next, we are going to multiply our exchange rate by the number of dollars we want to change, 300:

$300dollars*(0.7pounds)/(dollar) =210pounds$

We will get 210 pounds for 300 dollars

Answer:

210

Step-by-step explanation:

I'LL GIVE BRAINLIEST!! PLEASE BE QUICK< I NED SLEPP! -v-'

Answers

The answer is B,
I took the test and it’s the only one that really makes sense

Suppose it took 19 riders a total of 11 days 21 hours to ride from St. Joseph to Sacramento. If they all rode the same number of hours, how many hours did each rider ride?

Answers

Answer:

The number of hours each riders ride = 15 hours.

Step-by-step explanation:

19 riders = 11 days 21 hours to ride from St.Joseph to Sacramento

Let's find the number of hours taken.

1 day = 24 hours.

11 days = 11 times 24 = 264 hours

So, 11 days 21 hours = 264 + 21 = 285 hours

19 riders rode the same number of hours.

To find the each rider ride, we need to divide 285 by 19.

The number of hours each rider ride = $(285)/(19) = 15$ hours.

I’m not sure if I’m right but I tried.First I multiplied 11 times 24,because there's 24 hours in a day,then I got 264. So then I added 21 hours more to it, so then I got 285.So then I divided 285 out of 19,since there is 19 riders, and I got 15. So 15 might be the answer to the problem. (But I’m still not sure, atleast I tried right?)

I need help with these two questions

Answers

Answer:

Given

Step-by-step explanation:

The Lateral surface area is the surface area of only 4 sides of the figure, that is, area excluding top and bottoms sides.

Lateral surface area of cuboid

= 2h (l+b)

where h is height

b is breadth

l is length

= 2*12 (5+4)

= 2*12*9

= 216 m^2

Lateral surface area of cube

= 4s^2

where s is the side

= 4*(2)^2

= 4*4

= 16m^2

Blank hundreds =80 tens

Answers

so 10 tens=100 and then u will understand that by multiplying by 8 = 800

80 tens = 80*10 = 800

8 hundreds = 80 tens

Answer: 8 hundreds

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