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3 years ago

Plzzzz... tell fast

Mathematics

1 answer:

blondinia [14]3 years ago

5 0

Answer:

its 4x

Step-by-step explanation:

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Rick ran for hour on Wednesday for a distance of 4.2 miles. On Thursday, he ran for 1 hour at the same speed he ran on Wednesday

just olya [345]

Answer: C.5.60 miles

Step-by-step explanation:

I don’t know the explanation but I got it correct on a test that I was taking...

5 0

3 years ago

15 point question

Natalka [10]

Answer:

It will cost $12.5 per person to charter a bus for 36 passengers

Step-by-step explanation:

The cost per person c of chartering a tour bus varies inversely as the number of passengers n.

We can write:

$c\:\alpha \:\frac{1}{n} \\c=\frac{k}{n}$

where k is constant of proportionality

We are given when c = 22.50, n = 20

We need to find c when n = 36

First using c = 22.50, n = 20 we will find k, the constant of proportionality

$c=\frac{k}{n}\\22.50=\frac{k}{20}\\k=22.50 \times 20\\k=450$

So, we get k = 450

Now, we will find c when n = 36

$c=\frac{k}{n}\\c=\frac{450}{36}\\c=12.5$

So, we get the value of c: c = 12.5

Therefore, It will cost $12.5 per person to charter a bus for 36 passengers

8 0

3 years ago

Show that if A is invertible, then det Upper A Superscript negative 1det A−1equals=StartFraction 1 Over det Upper A EndFraction

netineya [11]

Answer:

Therefore

$det(A)*det(A^{-1}) = 1$ and $det(A^{-1}) = 1/det(A)$

Step-by-step explanation:

Remember that if

$I$ = Identity Matrix

then $det(I)=1$ .

Also remember that for any invertible matrix

$A*A^{-1} = I =$ Identity Matrix.

Therefore

$det(A*A^{-1}) = det(A)*det(A^{-1}) = det(I) = 1$

Therefore

$det(A)*det(A^{-1}) = 1$ and $det(A^{-1}) = 1/det(A)$

7 0

3 years ago

Mr. Littles is building a triangular sandbox using three boards. He already has two boards that measure 9 feet and 12 feet. Sele

Bess [88]

Answer:

9 feet, 15 feet, 19 feet

Step-by-step explanation:

Options are:

2 feet
3 feet
9 feet
15 feet
19 feet
21 feet
30 feet

-------------------------------------

Use the triangle inequality theorem: sum of any two side must be greater than the third side by length

2 feet ⇒ no, as 2 + 9 < 12
3 feet ⇒ no, as 3 + 9 = 12
9 feet ⇒ yes
15 feet ⇒ yes
19 feet ⇒ yes
21 feet ⇒ no, as 9 + 12 = 21
30 feet ⇒ no, as 9 + 12 < 30

6 0

3 years ago

You need a 15% acid solution for a certain test, but your supplier only ships 5% solution and 17.5% solution. If you need 20 lit

Nimfa-mama [501]

Answer:

4 liters of 5% and 16 liters of 17.5%

Step-by-step explanation:

Let quantity of 5% be x liters and of 17.5% be y liters

x+y=20 hence y=20-x

Introducing percentages

0.05x+0.175(20-x)=0.15*20

0.05x+3.5-0.175x=3

-0.125x=-0.5

$x=\frac {-0.5}{-0.125}=4$

Therefore, y=20-x=20-4=16

You need 4 liters of 5% and 16 liters of 17.5% to achieve 20 liters of 15% acid solution

6 0

3 years ago

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