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Akimi4 [234]
3 years ago
15

The average of 3 numbers is 15 two of the numbers are 7 and 10 what is the third number?

Mathematics
1 answer:
Zielflug [23.3K]3 years ago
8 0

9514 1404 393

Answer:

  (b)  28

Step-by-step explanation:

The total of the 3 numbers will be 3×15 = 45. Then the third number is ...

  45 -7 -10 = 28

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Help me with this question ​
enot [183]

Answer:

37.2

Step-by-step explanation:

when you turn the small triangle LMN to its right angle to cover the right angle of KLM, you find that they are similar triangles.

therefore the corresponding side lengths are at the same ratio.

LM/KM = MN/LN

LM = 24

MN = 13

we can get LN via Pythagoras of the small triangle

LN² + MN² = LM²

LN² + 13² = 24²

LN² = 24² - 13² = 576 - 169 = 407

LN = sqrt(407) = 20.174241

now back to our main problem

24/KM = 13/sqrt(407)

24×sqrt(407)/13 = KM = 37.2

4 0
3 years ago
Can u help me with these questions
Olin [163]

here's half of them:

1: 15 - (3r) = 6

2: q + 4f = 29

3: n^{2} + 12 = p/4

4: 0.5j - 5 = k + 13

for the rest, just know that:

sum means addition

times/product means multiplying

quotient means division

less than means subtraction

8 0
4 years ago
14. Michelle simplified an expression for the perimeter of the rectangle below and got X + 35.
Zigmanuir [339]

Answer:

The correct expression for the perimeter is P=(\frac{5}{3}x+70)\ units

see the explanation

Step-by-step explanation:

The complete question in the attached figure

Let

L ----> the length of rectangle

W ---> the width of rectangle

we know that

The perimeter of rectangle is equal to

P=2(L+W)

In this problem we have

L=(\frac{5}{6}x+23)\ units

W=12\ units

substitute the values

P=2(\frac{5}{6}x+23+12)

P=2(\frac{5}{6}x+35)

P=(\frac{10}{6}x+70)\ units

Simplify

P=(\frac{5}{3}x+70)\ units

so

Michelle didn't multiply the sum of length and width by 2

6 0
3 years ago
)A sign on the road says: “Speed limit, 60 mph.” Could 60 be a value of s? Explain your reasoning.
GalinKa [24]

Answer:maybe

Step-by-step explanation:It depends on your formula lets say that the formula is T=d/r

T=time

D=distance

R=rate

which when you put in r it would be the speed so if

the formula is s instead of r it means the same thing just how fast the car is moving.

7 0
3 years ago
What is the next number in this geometric sequence?
Anna11 [10]

Answer:

C. -262.44

Step-by-step explanation:

-3.24, 9.72,-29.16, 87.48

-3.24*-3= 9.72, 9.72*-3= -29.16, -29.16*-3= 87.48

the rule for this sequence is multiplying by -3

87.48*-3= -262.44

8 0
3 years ago
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