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S_A_V [24]
3 years ago
14

Evaluate the expression. 34 -8 - 14 + 2 + 5​

Mathematics
1 answer:
IceJOKER [234]3 years ago
5 0

Answer:

            About 20

           {19 exactly}

Step-by-step explanation:

Evaluate means find approximate value without exact calculation (usually done with great numbers or with fractions)

-8 is approximately -(2+5) so the sum is about 0

34-14 = 30-10 = 20

20 + 0 = 0

The exact calculation would be:

34 -8 - 14 + 2 + 5 = 34 - 14 - 8 + 7 = 20 - 1 = 19

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A car travels 80 kilometres in 2 and a half hours. What is its speed in kilometres per hour?
Allisa [31]
If a car travels 80 km/total distance is 450 km, how much time is required to reach? A car covers half of the distance between two places at 40km per hour and the other half distance at 60 km per hour!

I hope this helped! Mark me Brainliest! :) -Raven❤️
4 0
3 years ago
Find the range.<br> 3 –9 7 –1 5 –4 2
Fed [463]

Answer: The range is 16 :)

Step-by-step explanation:

The lowest number is -9 and the highest is 7. the difference between those is 16.

4 0
3 years ago
Let R(x)=3x^3+2x^2+x and S(x)=4+1. Find R(x) * S(x) <br><br> Pls help!!!!
Katarina [22]

3x^3 x 4x^2 = 12x^5

3x^3 x 1 = 3x^3

2x^2 x 4x^2 = 8x^4

2x^2 x 1 = 2x^2

1x x 4x^2 = 4x^3

1x x 1 = 1x

12x^5 + 3x^3 + 8x^4 + 2x^2 + 4x^3 + 1x

Simplify

12x^5 + 7x^3 + 8x^4 + 2x^2 + 1x

Thus, answer is B

Hope this helps!

3 0
2 years ago
I need help with these two questions!! I got 72° for Question 7, I don't know I need help with both of them!! PLEASE HELP!! :)
Nat2105 [25]

Answer:

7. 49

8. 10.4

Step-by-step explanation:

7) our hypotenuse is 8, and the side opposite the base of ladder and ground angle is 6, therefore we can use Sin

sin = opposite/hypotenuse

sin(x) = 6/8 = 3/4

sin-1(3/4) = 49

8) using the theorem that alternate exterior angles are congruent

the angle opposite side x is 30

tan = opposite/adjacent

tan(30) = x/18

x = 18tan(30) = 6√(3) = 10.4

you can also use 30-60-90 special right triangles.

the side opposite 30 is x

side opposite 60 is x√(3)

and side opposite 90 is 2x

3 0
3 years ago
If z^2+1/z^2=11 , find the value of z^3-1/z^3,using only the positive value of z-1/z
vredina [299]
Hello,

Let's assume

t=z- \dfrac{1}{z} \\\\&#10;&#10;t^2=z^2-2+ \dfrac{1}{z^2}= 11-2=9==\ \textgreater \ t=3\\\\&#10;&#10;t^3=z^3-3z^2* \dfrac{1}{z} +3z* \dfrac{1}{z^2} - \dfrac{1}{z^3} \\\\&#10;=z^3 - \dfrac{1}{z^3} -3(z-\dfrac{1}{z})\\\\&#10;z^3 - \dfrac{1}{z^3}=t^3+3t=3^3+9=27+9=36&#10;&#10;&#10;
7 0
3 years ago
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