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4 years ago

A student used the following elevations in a calculation.

Mathematics

1 answer:

Alona [7]4 years ago

6 0

Answer:

second one

Step-by-step explanation:

above sea level means it’s positive

below sea level is negative

(think of the sea level as 0)

the student should be using this equation

29,035-(-1,349) not 29,035-1349

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Find x. (Use pic for more info)

V125BC [204]

Answer:

x=75

Step-by-step explanation:

Hey There!

If you didn't know the exterior angle of a triangle is equal to the sum of the opposite interior angles of a triangle

So essentially what I'm saying is that

2x-5=70+x

step 1 add 5 to each side

-5+5 cancels out

70+5=75

now we have

2x=70+x

step 2 subtract x from each side

x-x cancels out

2x-x=x

we're left with

x=75

8 0

3 years ago

Write the general equation for the circle that passes through the points: (1, 7) (8, 6) (7, -1)

Naddika [18.5K]

Answer:

$x^{2} +y^{2} +(-8)\times x+ (-6)\times y = 0$

Step-by-step explanation:

General equation of circle is $x^{2} +y^{2} +2\times g \times x+2\times f\times y+c = 0$ ---------------------(1)

This circle passes through the given three points, (1,7) , (8,6) and (7,-1).

Substitute (1,7) in (1),

1 + $7^{2} +2\times g\times 1 + 2\times f\times 7 +c$ =0

2g + 14f + c = -50 -------------(2)

Substitute (8,6) in (1),

$8^{2} + 6^{2} +2\times g \times 8+2\times f\times 6 +c=0$

16g + 12f + c = -100 -----------(3)

Substitute (7,-1) in (1),

$7^{2} + (-1)^{2} +2\times g \times 7+2\times f\times (-1) +c=0$

14g - 2f + c = -50 ---------------(4)

Solving (2),(3) amd (4) simultaneously,

g = -4

f = -3

c = 0

Equation of circle is

$x^{2} +y^{2} +(-8)\times x+ (-6)\times y = 0$

7 0

3 years ago

Find the vector reciprocal to set. a= i+2j+2k, b= 2i+3j+k, c= i-j-2k

inn [45]

Answer:

I just do a' as a sample. You calculate b' and c'

Step-by-step explanation:

$a'=\frac{b\times c}{a\bullet (b\times c)}, b' = \frac{c\times a}{a\bullet (b\times c)}, c' = \frac{a\times b}{a\bullet (b\times c)}$

Now, calculate b x c

$\left[\begin{array}{ccc}i&j&k\\2&3&1\\1&-1&-2\end{array}\right] =$

$a'=\frac{}{\bullet }=\frac{}{-5} =$

7 0

3 years ago

Round the number to the thousandths place. <br> 39,015.892491

RSB [31]

39,015.892491 rounded is 39,000
Hope I helped :))

4 0

4 years ago

a triangle has sides 35cm, 54cm and 61cm long. find it's area, also find the smallest of its altitudes

KiRa [710]

Whats the length, base and height of the triangle

4 0

3 years ago