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3 years ago

Choose the variable. A 31 B m

Mathematics

1 answer:

rodikova [14]3 years ago

6 0

Answer:

B. m

Step-by-step explanation:

Hey there!

A variable is an unknown quantity in an equation or problem.

For example, the problem 3x=15

We want to find out what times 3 will give us 15. x is our unknown quantity.

Hope this helps you! Feel free to comment any questions you may have for me!

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What is the area of triangle ABC ? round to the nearest square unit ?

mash [69]

Answer: 33 square units

Step-by-step explanation:

Given: Sides lengths of the triangle : 16 units, 10 units, 8 units.

Heron's formula:-

$\text{Area of triangle}=\sqrt{s(s-a)(s-b)(s-c)}$ , where s is the semiperter and a,b and c are the side-lengths of the triangle.

Let a=16 , b=10 and c=8

Then,

$s=\dfrac{a+b+c}{2}=\dfrac{16+10+8}{2}=17$

Using Heron's formula:-

$\text{Area of triangle}=\sqrt{17(17-16)(17-10)(17-8)}\\\\\Rightarrow\ \text{Area of triangle}=\sqrt{1071}=32.7261363439\approx33\text{ square units}$

5 0

3 years ago

Find the value of a2 + b when a = -2 and b = 5

REY [17]

Answer: 9

Step-by-step explanation: In this problem, we're going to evaluate a² + b knowing that a = -2 and b = 5.

So the first thing we want to do is substitute these numbers into our problem.

Since a = -2, we will replace a with a -2 and as we do that, we will put that -2 in parentheses and square it since we have a². Squaring a number just means multiplying a number by itself so (-2)² is equal to 4 since a negative multiplied by a negative gives us a positive.

Now we will replace b with 5 and now we have the following.

4 + 5 simplifies to 9.

4 0

3 years ago

(03.04 LC) When the function f(x) = 4(2)x is changed to f(x) = 4(2)x − 13, what is the effect? There is no change to the graph b

Ksenya-84 [330]

Answer:

The y-intercept moves 13 spaces lower

Step-by-step explanation:

3 0

3 years ago

What is the slope of the line shown below? A. -3 B.-6 C.6 D. 3

aniked [119]

Answer:

D.3

Step-by-step explanation:

We are going to use the Slope Formula --> (y2-y1)/(x2-x1)

(9-3)/(3-1)=6/2=3

6 0

3 years ago

A music app charges $2 to download the app plus $1.29 per song downloaded wright and solve a linear equation to find the total c

fredd [130]

The linear equation used to solve the problem is t = 2 + 1.29a and total cost to download 30 songs is $ 40.7

Solution:

Given that music app charges $2 to download the app plus $1.29 per song downloaded

To find: write and solve a linear equation to find the total cost to download 30 songs

Let us first write a expression for total cost

Let "a" be the number of songs downloaded

So we can frame a equation as:

total cost = initial charge + cost of 1 song download x number of songs downloaded

$total cost = 2 + 1.29 \times a$

total cost = 2 + 1.29a

If "t" represents the total cost, then the linear equation is:

t = 2 + 1.29a

finding the total cost to download 30 songs:

Here a = 30

Substitute a = 30 in above formula

total cost = 2 + 1.29(30)

total cost = 2 + 38.7

total cost = 40.7

Thus total cost to download 30 songs is $ 40.7

3 0

3 years ago