2 years ago

Create a system of equations to solve

1 answer:

6 0

R=2K which equals 2R=4K
4(R=K+8) or 4R=4K+32

Subtract first equation from second equation.
2R=32 so R=16

Plug into first equation
16=2K so K=8

Now plug both into second equation to check
4R-4K=4(R-K)=4(8)=32 it works

So Roberto is 16 and Katie is 8
(In 4 years R would be 20 and K would be 12 which has a difference of 8)

You might be interested in

A/b=c for b<br> Wht is b

Naddik [55]

The answer would be b=a/c

4 0

2 years ago

Find the mean of A and find the median on letter B

mash [69]

A: the mean salary is $500.
400+500+600=1500/3=500
b: the median is $500 also.

3 0

3 years ago

Read 2 more answers

It is estimated that 30% of households own a riding lawn mower. A sample of 17 households is studied. What is the standard devia

alina1380 [7]

Answer:

1.89 is the standard deviation of households who own a riding mower

Step-by-step explanation:

Let the random variable X denote the number of households owning a riding lawn mower. From the given information, X will be a Binomial random variable with parameters; n = 17 and p = 30% = 0.3

The standard deviation of X;

$\sqrt{n*p*(1-p)}$

$\sqrt{17*0.3*(1-0.3)} =1.89$

7 0

2 years ago

For the graph, locate the x-intercept and the y-

chubhunter [2.5K]

X intercept= 6
y intercept= -2

7 0

3 years ago

For y = x^2 + 10x + 24, write the axis of symmetry, the vertex, and whether the

mylen [45]

Answer:

x= - 2

Step-by-step explanation:

hello :

note : the equation of the axis symmetry for the parabola : y =ax²+bx+c

when : a≠ 0 is : x=- b/2a

in this exercice : a=1 and b=10

so : x= -10/2 = -5

7 0

3 years ago