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Ket [755]
2 years ago
13

The scale model of a skyscraper being built is 4.2 feet tall.

Mathematics
1 answer:
Dafna11 [192]2 years ago
4 0
529.2 .......................................
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1) Working alone, Beth can tar a roof in 151
Pachacha [2.7K]

Answer:

A) 7.24 hours

Step-by-step explanation:

The together rate is the sum of each separate rate.

In this problem:

Beth's rate is 1/15(suppose there was a small typing mistake there, with 151 none of the options are correct).

Mike's rate is 1/14

The together rate is 1/x

Then

We want to find x.

\frac{1}{15} + \frac{1}{14} = \frac{1}{x}

15*14 = 210. So

\frac{14 + 15}{210} = \frac{1}{x}

\frac{29}{210} = \frac{1}{x}

Cross multiplication

29x = 210

x = \frac{210}{29}

x = 7.24

So the correct answer is:

A) 7.24 hours

8 0
3 years ago
An airplane takes off from an airport. When the
Ivanshal [37]

The angle of elevation is = 70° and the distance the airplane travelled in the air is = 17,557ft

<h3>Calculation of the distance travelled</h3>

  • To calculate the angle of elevation of the airplane

tan x° = opposite/adjacent

where opposite = 16,500 feet

adjacent = 6,000 ft

tan x° = 16,500 / 6,000

tan x° = 2.75

X = arctan ( 2.75)

X = 70°

  • To calculate the distance the airplane travelled in the air Pythagorean Theorem is used.

C² = a² + b²

C² = 16,500² + 6,000²

C² = 272250000 + 36000000

C² = 308250000

C= √308250000

C= 17,557ft

Learn more about Pythagorean Theorem here:

brainly.com/question/343682

#SPJ1

3 0
2 years ago
What is the value of c such that x2 + 10x + c is a perfect square trinomial?
Charra [1.4K]
C = (10/2)^2 = 25 to make this the square (x +5)^2.
5 0
3 years ago
The following expression is written by some students: A+B=C. if ''A'' is always twice the value of ''B''. what is the value of '
ANEK [815]

Answer:

c=3

Step-by-step explanation:

a+b=c

a is double the value of b, so if a is 2, then b is 1.

2+1=3

hope this helps!

please mark me brainliest. thanks!

6 0
2 years ago
Helpppp!! right answer only pleaseee
hodyreva [135]

Answer:

linear equation

Step-by-step explanation:

it's the only one that matches the description :)

5 0
3 years ago
Read 2 more answers
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