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qwelly [4]
3 years ago
9

Multiple choice what is -1.8 - 3.9=

Mathematics
2 answers:
poizon [28]3 years ago
7 0

Answer:

1. -5.7

Step-by-step explanation:

When a negative number and another negative number are being added together (but this differs in multiplication and division though), the answer will always be negative, unless a greater positive (combination or single) number is being added to those, but in this case, it is just two negative numbers. What you can do here is add the absolute values of the negative numbers, which would be 1.8 + 3.9, since absolute values are always positive numbers. Once you add these values, which gives you 5.7, you make the answer negative, because before, you were adding negative numbers, so your answer would be -5.7.

Just so you can make sure your answers are correct for the next ones:

2. -2

3. -4.4

Law Incorporation [45]3 years ago
3 0

Answer:

1.    -5.7

2.  -2

3.  -4.4   

Step-by-step explanation:

cant see all of question 4.

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Please answer this correctly
satela [25.4K]

Answer:

A =12.56 m^2

Step-by-step explanation:

Find the area of a circle with radius 4

A = pi r^2

A = 3.14 * 4^2

A =50.24

Since this is 1/4 of the circle, multiply by 1/4

A = 1/4 * 50.24

A =12.56 m^2

4 0
4 years ago
Read 2 more answers
Find the slope using the formula.<br> (3,-2) and (3, 6)
dangina [55]

Answer:

m = undef

General Formulas and Concepts:

<u>Pre-Algebra</u>

  • Order of Operations: BPEMDAS

<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>

Point (3, -2)

Point (3, 6)

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

  1. Substitute:                    m=\frac{6+2}{3-3}
  2. Add/Subtract:               m=\frac{8}{0}
  3. Divide:                          m = undef

When we divide anything by zero, we will get undefined. Therefore, this would be a vertical line.

6 0
3 years ago
patrick had 144 coins in his collection of nickels and quarters. If the coins have a total value of $20, how many are nickels an
yuradex [85]

Answer:

30

Step-by-step explanation:

4 0
2 years ago
Determine the correct equation used in order to solve the problem "The number 24 is what percent of the number 40?"
lions [1.4K]

The correct equation that represents the expression "The number 24 is what percent of the number 40?" is as shown below;

The the unknown number in percent be 'x'

x percent of number 40 is expressed as;

x% of 40

x/100 of 40

If 24 is equal to the expression above, then the final equation will be expressed as;

24 = x/100 of 40

24 = 40x/100

24 = 0.4x

Rearrange

0.4x = 24

Hence the correct equation used to solve the problem is 0.4x = 24

4 0
1 year ago
A ball is thrown into the air. The height h, in feet, of the ball can be modeled by the equation h= -16t^2 + 20t + 6, where t is
Alik [6]
Hello : let h =f(t)
<span>the ball hit the ground if : f(t) =0
solve : </span><span> -16t² + 20t + 6=0
</span><span>Δ = b²-4ac  ... a = -16    b= 20     c =6
</span>Δ =(20)²-4(-16)(6) = 784 = 28²
t1 = (-20-28)/-32 = 48/32 =3/2
t2 =(-20+28) /-32 <span>< 0 refused
conclusion : t=3/2</span>
5 0
4 years ago
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