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Harrizon [31]
4 years ago
11

Rob is two times as old as Jake. Three years ago the sum of their ages was 21 years. Find their present ages?

Mathematics
2 answers:
spin [16.1K]4 years ago
8 0
Rob is 18
Jake is 9

21-15=6
6+3=9
9x2=18
(No clue how I got 15 )
Citrus2011 [14]4 years ago
8 0

Suppose Rob's age is X and Jake's age Y

Since Rob is two times as old as Jake, X = 2Y

Since Three Years ago the sum of their ages was 21,

X + Y = 21 + 6 This is true because it was three years ago, so they both got older by 3 years

You plug in X to the second equation to fin 2Y + Y = 21 + 6 which is 3Y = 27, so Y = 7 Then, you plug this into the first equation and find that X = 14

So Rob is 14 and Jake is 7

Hope this helps :)

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What is the value to this I need help on this
DIA [1.3K]

Answer:

x=4

Step-by-step explanation:

The question shows an isoceles triangle, which means both sides should equal:

28=9x-8

36=9x

x=4

7 0
3 years ago
What is the volume of the rectangular prism in cubic yards?​
strojnjashka [21]

The volume of the rectangular prism is 1120 yd³.

<h3>What is a prism?</h3>

A prism is a solid geometric figure whose two ends are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms.

To calculate the volume of the rectangular prism, we use the formula below.

Formula:

  • V = LWH.......... Equation 1

Where:

  • V = Volume of the rectangular prism
  • L = Length of the prism
  • W = Width of the prism
  • H = Height of the prism.

From the question,

Given:

  • L = 14 yards
  • W = 8 yards
  • H = 10 yards.

Substitute thee values into equation 1

  • V = 14×8×10
  • V = 1120 yd³

Hence, The volume of the rectangular prism is 1120 yd³.

Learn more about prism here: brainly.com/question/12691050

6 0
2 years ago
I need help I’ll give you points it’s urgent
nlexa [21]

Answer:

Step-by-step explanation:

Area: 28.26

Circumference: 12.56

8 0
4 years ago
Help on section A :)
N76 [4]
Hey there!

To start, the domain of a function is the set of x values a function has, in other words, the values the function has on the x-axis.

In this function, the graph appears to have a function going on infinitely in both directions (left and right). Because of this, your domain in interval notation would be (-∞,∞) 

**Your interval notation would be in parenthesis because you cannot include negative or positive infinity as one of your values since while your graph is approaching these values, it never really reaches it.

Hope this helps and have a wonderful day! :)
5 0
3 years ago
What is the common ration between successive term in the sequance? 2,-4,8,-16,32,-64
Cerrena [4.2K]
Multiplicity of -2 is your answer

hope this helps
5 0
3 years ago
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