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3 years ago

I will mark you brainlest!

Mathematics

1 answer:

miskamm [114]3 years ago

8 0

Answer: 63

Step-by-step explanation:

14.5x1.5=21.75

15x2.75=41.25

21.75+41.25=63

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What is the formula for the following arithmetic sequence? -9,-2,5,12

I am Lyosha [343]

Answer:

-9 + (n-1)-7

Step-by-step explanation:

formular for AP is

a+ (n-1)d

where A is -9

d is 5--2=7

or -2--9=7

7 0

3 years ago

Problem

Stels [109]

Answer:

The maximum speed of Hal's airplane in still air is:

$v= 250\ miles/h$

The speed of the wind

$c = 50\ miles/h$

Step-by-step explanation:

Remember that the velocity v equals the distance d between time t.

$v=\frac{d}{t}$ and $t*v=d$

The distance that Hal travels when traveling with the wind is:

$(2\ hours)(v + c) = 600$ miles

Where v is the speed of Hal and c is the wind speed.

The distance when traveling against the wind is:

$(3\ hours)(v-c) = 600$ miles

Now we solve the first equation for v

$(2)(v + c) = 600$

$2v + 2c = 600$

$2v= 600-2c$

$v= 300-c$

Now we substitute the value of v in the second equation and solve for c

$3((300-c)-c) = 600$

$3(300-2c) = 600$

$900-6c = 600$

$-6c = 600-900$

$-6c = -300$

$6c = 300$

$c = 50\ miles/h$

Then:

$v= 300-(50)$

$v= 250\ miles/h$

The maximum speed of Hal's airplane in still air is:

$v= 250\ miles/h$

The speed of the wind

$c = 50\ miles/h$

7 0

3 years ago

20 is 40 percent of??? please need answer

Fed [463]

Answer:

x = 50

Step-by-step explanation:

Let x be the original number.

This question can be expressed as:

0.4x = 20

0.4 of the original number is 20.

Now, we can directly solve for x:

4x = 200

x = 50

8 0

3 years ago

Read 2 more answers

What is the square root of 139

VladimirAG [237]

Square root of 139:
√139 = 11.78983

8 0

3 years ago

Write an equivalent expression by distributing the "-−" sign outside the parentheses:

charle [14.2K]

Answer:

6.6a+6b-7.1

Step-by-step explanation:

$-(-6.6a-6b)-7.1\\\\=-(-6.6a)-(-6b)-7.1\\\\=6.6a+6b-7.1$

7 0

3 years ago