PLEASE HELP ASAP!!! i’ll mark brainlessly

Answers

Answer 1

Answer:

1.5 km per hour

ngl i could be wrong :/

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Which expression means 2 less than a number? A. 2 ÷ p B. p + 2 C. 2 × p D. p – 2

there are about 2.5 x 10^10 red blood cells in the average adult. about how many adults would it take to have a total of 1 googol red blood cells?

Answers

3829878793309309202902930902022000

Please answer them correctly i need these points please.

Answers

Answer:

The first one is B The second one is D and the last one is A

Barb walked 1.3 miles to her friend's house and then 3/4 mile to the library. How far did Barb walk in all?

Answers

Answer:

1.78 miles

Step-by-step explanation:

3/4 = .75 of a mile + 1.3 = 1.78

The answer is 2.05.

you can make the fraction into a decimal, 3/4=0.75, then you just add 0.75 to 1.3.

X-y+z=-4

3x+2y-z=5

-2x+3y-z=15

How do I solve this?

Answers

$1)\ \ \ x-y+z=-4\ \ \ \Rightarrow\ \ \ z=-4-x+y\n\n2)\ \ \ 3x+2y-z=5 \n.\ \ \ \ \Rightarrow\ \ 3x+2y-(-4-x+y)=5 \n.\ \ \ \ \Rightarrow\ \ 3x+2y+4+x-y=5 \n.\ \ \ \ \Rightarrow\ \ 4x+y=1\n\n3)\ \ \ -2x+3y-z=15\n.\ \ \ \ \Rightarrow\ \ -2x+3y-(-4-x+y)=15\n.\ \ \ \ \Rightarrow\ \ -2x+3y+4+x-y=15\n.\ \ \ \ \Rightarrow\ \ -x+2y=11\n--------------------\n$

$z=-4-x+y\n.\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ and\n \left \{ {{4x+y=1\ \ \ \ } \atop {-x+2y=11\ /\cdot4}} \right. \n\n\left \{ {{4x+y=1\ \ \ \ } \atop {-4x+8y=44}} \right. \n-------\ny+8y=1+44\n9y=45\ /:9\ny=5\n\n-x+2y=11\ \ \ \Rightarrow\ \ \ x=2y-11\ \ \ \Rightarrow\ \ \ x=2\cdot5-11=-1\n\nz=-4-x+y=-4-(-1)+5=-4+1+5=2\n\nAns.\ x=-1\ \ \ and\ \ \ y=5\ \ \ and\ \ \ z=2$

A researcher selects a sample of participants to test for differences in employment rates among part-time and full-time teachers. Because there are many more women in teaching jobs than men, the researcher selected more women than men for her study to ensure that it represented the actual distribution of men and women teachers in the job sector. Which type of quota sampling was used in this example

Answers

Answer: proportionate

Step-by-step explanation:

Proportional quota sampling is when the total number of people that are to be surveyed are decided in advance. This form of sampling is usually used in opinion polls and surveys.

Since due to the fact that there are many more women in teaching jobs than men, the researcher selected more women than men for her study to ensure that it represented the actual distribution of men and women teachers in the job, then this was decided in advance and indicates the proportionate quota sampling.

Please help really fast

Answers

If you cut an isosceles triangle in half, you get a right angled triangle.
You can work out 'd' or the hypotenuse using Pythagoras's theorem:
a^2 + b^2 = c^2

Because we are looking at half of the triangle, we have to half the base, 14m. So you get 7m. But the height of the triangle, 5m, stays the same.

So if you out the figures into the formula you'd get:
7^2 + 5^2 = d^2

To get 'd' you have to square root the first half of the equation. So you get:
√7^2 + 5^2 = d

The above is the answer :)

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