All categories

2 years ago

What is algebraic expression for a number increased by 13 is 1,989.

Mathematics

2 answers:

SpyIntel [72]2 years ago

7 0

Let the variable n represent the unknown number

Start with n

$\tt \longrightarrow \: n$

Increased by 13 means add 13 to it

$\tt \longrightarrow \: n + 13$

Is 1989 means it equals 1989

$\tt \longrightarrow \: n + 13 = 1989$

➪ Thus, The final equation is (n+13=1989)

White raven [17]2 years ago

4 0

Answer:

expression: x + 13 = 1989

explanation:

Let the number be x

so when this number is increased " + " by 13, it equals to 1989

processing:

x + 13 = 1989

x = 1989 - 13

x = 1976

The number is 1976.

The algebraic equation used: x + 13 = 1989

You might be interested in

The roof of this garden shed has a gradient of 0.35. find the height of the shed

Ilya [14]

The height of the shed is 2.325 m

The complete question is

The roof of a lean-to-garden shed has a gradient of 0.35.find the height....they have given the base as 1.5m and a shorter height 1.8m its like a house

<h3>What is a right Triangle ?</h3>

In a Triangle when one angle is 90 degree , the triangle is called Right Triangle .

Structure of the house is a right triangle with base = 1.5m

(height of that triangle)/1.5 = 35/100

height of that triangle = 1.5*0.35 = 0.5250

Ans: greater height of the lean-to = 1.8 + 0.5250 = 2.325 meters.

The height of the shed is 2.325 m.

To know more about Right Triangle

brainly.com/question/6322314

#SPJ1

6 0

2 years ago

Suppose it takes 45 hours for robot A to construct a new robot. Working together with robot B, it takes 25 hours for both robots

Len [333]

Answer:

56 hours 25 minutes

Step-by-step explanation:

Given:

Suppose it takes 45 hours for robot A to construct a new robot

It takes 25 hours for both robots to construct a new robot.

Question asked:

How long would it take robot B to construct a new robot, working alone ?

Solution:

Let the time taken by robot B to construct new robot = $x$

By robot A

It takes 45 hours to construct = 1 new robot

It takes 1 hour to construct = $\frac{1}{45} \ new\ robot$

By robot B

It takes $x$ hours to construct = 1 new robot

It takes 1 hour to construct = $\frac{1}{x}$ new robot

By working together

It takes 25 hours to construct = 1 new robot

It takes 1 hour to construct = $\frac{1}{25} \ new\ robot$

$\frac{1}{25}$ new robot is constructed in = 1 hour

New robot is constructed by both working together in 1 hour = New robot is constructed by robot A in 1 hour + New robot is constructed by robot B in 1 hour

$\frac{1}{25} =\frac{1}{45} +\frac{1}{x} \\$

Subtracting both sides by $\frac{1}{45}$

$\frac{1}{25}-\frac{1}{45} =\frac{1}{45} -\frac{1}{45}+\frac{1}{x} \\\\\frac{1}{25}-\frac{1}{45} =\frac{1}{x}\\\\ Taking\ LCM \ of \ 25\ and\ 45,\ we\ got\ 225$

$\frac{9-5}{225} =\frac{1}{x} \\ \\ \frac{4}{225} =\frac{1}{x}\\\\ By\ cross \ multiplication\\4\times x=225\\Dividing\ both\ sides\ by\ 4\\x=56.25\ hours$