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1 year ago

PLEASE PLEASE PLEASE HELP +30 POINTS!

Mathematics

2 answers:

Dmitrij [34]1 year ago

7 0

It is b, d, c, and d

zavuch27 [327]1 year ago

6 0

Answer:

1.option b

2.option c

3.option non (-39/20)

4.option a

Step-by-step explanation:

-7/9 x 3/5

$\frac{ - 7}{9} \times \frac{3}{5} \: \\ (3 \: and \: 9 \: are \: common \: so \: we \: can \: simplify them) \\ \frac{ - 7}{3} \times \frac{1}{5} \\ \frac{ - 7 \times 1}{3 \times 5} = \frac{ - 7}{15}$

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Mr. Atkins flies from Miami, Florida to Los Angeles, California. The trip is 7, 516 kilometers. He makes the trip 4 times a year

alex41 [277]

Answer:

30064, if round trip multiply by 2

Step-by-step explanation:

so this is just multiplication. I am not sure if its round trip, but if its not then its just the 7516 times 4= 30064

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3 years ago

A motorboat travels 189 kilometers in hours going upstream and 693 kilometers in 7 hours going downstream. What is the rate of t

Ostrovityanka [42]

Answer:

rate of the boat in still water: 81 km/h

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Step-by-step explanation:

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3 years ago

Using principle of mathematical induction prove that 6^-1 divisble by 5 .

salantis [7]

I suppose the claim is $5 \mid 6^n - 1$ for $n\in\Bbb N$ .

When $n=1$ , we have $6^1 - 1 = 6 - 1 = 5$ , and of course 5 divides 5.

Assume the claim holds for $n=k$ , that $5 \mid 6^k - 1$ . We want to use this to show it holds for $n=k+1$ , that $5 \mid 6^{k+1} - 1$ .

We have

$6^{k+1} - 1 = \left(6^{k+1} - 6\right) + \left(6 - 1) = 6\left(6^k - 1\right) + 5$

Since $5 \mid 6^k - 1$ , we can write $6^k - 1 = 5\ell$ for some integer $\ell$ . Then

$6^{k+1} - 1 = 6\cdot5\ell + 5 = 5(6\ell + 1)$

which is clearly divisible by 5. QED

5 0

2 years ago

The table shows the relationship between the two variables. Which selection describes the relationship?

kobusy [5.1K]

Answer:

Step-by-step explanation:

It's not linear but it is decreasing.

8 0

2 years ago

Read 2 more answers

An alloy is composed of nickel, zinc, and copper in a ratio of 7:2:9. How many kilograms of each metal are needed to make 3.6 kg

ivolga24 [154]

Answer:

Nickel= 1.8 kg

Zinc= 0.4 kg

Copper= 1.8 kg

Step-by-step explanation:

7:2:9

7=nickel

2=zinc

9=copper

7+2+9=18

18×2=36

7×2=14 2×2=4 9×2=18

Divide by 10

14÷10=1.4 4÷10=0.4 18÷10=1.8

1.8+1.4+0.4= 3.6

1.8=nickel

0.4=zinc

1.8=copper

8 0

3 years ago