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qaws [65]
3 years ago
8

What is the value of the expression x + (–y) when x = –2.3 and y = –5.9?

Mathematics
2 answers:
Natasha2012 [34]3 years ago
6 0
X+(-y)
x=-2,3
y=-5,9
-2,3-(-5,9)=-2,3+5,9=3,6
the value of the expresion x+(-y) is 3,6
kramer3 years ago
5 0
X + (-y) = -2.3 + ( - (-5.9) ) = -2.3 + 5.9 = 3.6
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How many different four lettered codes can be formed if the first letter must be an S or a T
emmainna [20.7K]

Answer:

27,600

Step-by-step explanation:

We use the following formula:-  

Number of permutations of r from n

= nPr

= n! / (n-r)!

I am assuming you don't allow repeated letters in the 4 letter codes.

Take S as the first letter. Then we have 3 letters extra out of 25 letters.

Using the above formula the possible ways of doing this is

25! / (25 - 3)!

25! / 22!

= 25*24*23

= 13800.

The same number is obtained if the first letter is a T.

So the answer is 2*13800

= 27,600

8 0
3 years ago
From a distance of 42 feet from the base of a building, the angle of elevation to the top of the building is 67 degrees. Estimat
Nataliya [291]
A diagram would surely help here.  But imagine that you stand at spot A and someone finds that your distance from the base of the building is 42 feet.  Call this point B.
 
Imagine a vertical line from that spot, straight up.  Label the top of this line C.

The acute angle at A is 67 degrees.  You want to find the height of the building, which would be the length of the "opposite side of triangle ABC."
The length of the "adjacent side of triangle ABC" would be 42 feet.

We don't know the length of the hypotenuse, altho' we could easilyl calculate it using the Pyth. Them.

We choose the tangent function to solve for the height of the building (which is the length of the opposite side. 

                                                                         height
By definition, tangent (67 degrees) = -------------------------------------
                                                                       42 feet

Find tan 67.  Multiply your result by 42 feet.  This product is the height of the building.
7 0
3 years ago
Find the slope or rate of change.
Dima020 [189]

Answer:

m=\frac{5}{3}

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Algebra I</u>

  • Slope Formula: m=\frac{y_2-y_1}{x_2-x_1}

Step-by-step explanation:

<u>Step 1: Define</u>

<em>Find points from graph</em>

Point (-2, 0)

Point (1, 5)

<u>Step 2: Find slope </u><em><u>m</u></em>

  1. Substitute:                   m=\frac{5-0}{1+2}
  2. Subtract/Add:              m=\frac{5}{3}
3 0
2 years ago
The figure below shows an upside-down pyramid with a square base.
Stella [2.4K]

Answer:

d

Step-by-step explanation:

when cut you can see that the cutout will be a square

the base is a square and the cut is parallel to the base

therefore the cutout will be a square

8 0
1 year ago
Read 2 more answers
Work out the surface area of this cylinder<br> 8.2 cm<br> 17.5 cm
ANTONII [103]

Answer: 1324.12 sq. cm.

Step-by-step explanation:

A=2πrh+2πr2

A = 2π x 8.2 x 17.5 + 2π x 8.2^2

A = 2π x 143.50 + 2π x 67.24

A= 1324.12

5 0
3 years ago
Read 2 more answers
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