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3 years ago

Help please will give brainliest

Mathematics

1 answer:

ser-zykov [4K]3 years ago

7 0

40=1.5f+2.25c, please mark brainiest and give it a heart (:

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Someone hiking a straight line up a mountain trail hikes a total of 7 miles to gain 2 miles of elevation. What is the angle of i

Svetlanka [38]

Answer:

16.6 degrees (to nearest tenth)

Step-by-step explanation:

Angle of inclination = the angle whose sine is 2/7.

Its the sine because 7 miles = hypotenuse and elevation ,2 miles , = opposite side).

This is 16.6 degrees (to nearest tenth)

5 0

3 years ago

Find how many positive integers with exactly four decimal digits, that is, positive integers between 1000 and 9999 inclusive, ha

zmey [24]

Answer:

(a) There are 257 numbers which are divisible by 5 and by 7

(b) There are 1286 numbers which are divisible by 7

(c) There are 4500 even numbers

(d) There are 514 numbers which are divisible by 5 but not by 7

Step-by-step explanation:

(a) Since, LCM(5, 7) = 35,

Thus, the numbers divisible by 5 and by 7 between 1000 and 9999,

1015, 1050, 1085............, 9975

Which is an AP,

Having first term, a = 1015,

Common difference, d = 35,

Last term, l = 9975

If n be the number of terms,

$\because l = a + (n-1)d$

$9975 = 1015 + (n-1)35$

$9975 - 1015 = (n-1)35$

$8960 = (n-1)35$

$256 = n-1$

$\implies n = 256 + 1 = 257$

(b) Similarly, number divisible by 7,

1001, 1008, 1015............, 9996

Here, a = 1001, d = 7, l = 9996

$9996 = 1001 + (n-1)7$

$9996 - 1001 = (n-1)7$

$8995 = (n-1)7$

$1285 = n-1$

$\implies n = 1285 + 1 = 1286$

(c) Even numbers between 1000 and 9999 inclusive

1000, 1002, 1004, 1006,........9998

Here, a = 1000, d = 2, l = 9998

$9998 = 1000 + (n-1)2$

$9998 - 1000 = (n-1)2$

$8998 = (n-1)2$

$4499 = n-1$

$\implies n = 4499 + 1 = 4500$

(d) Number divisible by 5,

1000, 1005, 1010............, 9995

Here, a = 1000, d = 5, l = 9995

$9995 = 1000 + (n-1)5$

$9995 - 1000 = (n-1)5$

$8995 = (n-1)5$

$1799 = n-1$

$\implies n = 1799 + 1 = 1800$

Hence, the number divisible by 5 but not by 7 = numbers divisible by 5 - number divisible by 7

= 1800 - 1286

= 514

8 0

4 years ago

Why is the answer B? Plz explain.

Ivanshal [37]

Step One

Develop a formula for the perimeter.

Argument

What you see is a semicircle going upwards and another one going downwards. Two semicircles =1 circle.

The "perimeter" [Circumfrence] of a whole circle = 2*pi*r

We are told that whatever you call this the perimeter is 8pi + 16

Step Two

Set up the equation

8pi + 16 = 2*pi*r + 4r Including the line connecting these two.

Step Three

Take out the common factors on the left and right.

8(pi + 2) = 2r(pi + 2) Divide both sides by pi + 2

8 = 2r Divide by 2

4 = r

Sorry. I didn't know the meaning of perimeter. Mathmate is perfectly correct.

6 0

3 years ago

There are 6 girls and 7 boys in a class. A team of 10 players is to be selected from the class. What is the probability that a r

sveticcg [70]

70 percent is my asnwer

8 0

3 years ago

Please solve the math question: |4x−4(x+1)|=4

alexgriva [62]

Answer:

x has infinite solutions

Step-by-step explanation:

|4x−4(x+1)|=4

Simplify inside the absolute value by distributing the 4

|4x−4x+4|=4

Combine like terms

|4|=4

The absolute value of 4 is 4

4=4

This is always true, so x is all real values

x has infinite solutions

3 0

4 years ago

Read 2 more answers