3 years ago

If a = -9 and b = 4, what is the value of a + b ? A. -5 B. 5 C. -13 D. 13

Mathematics

1 answer:

madreJ [45]3 years ago

7 0

Answer:

A. -5

Step-by-step explanation:

-9 + 4 = -5

hope this helps

You might be interested in

Identify the property or rule shown by each equation. 9 divided 1 =9 and 33 times 1 =33

kicyunya [14]

identity property=something times one

5 0

4 years ago

The roots of the function f(x)=x^2-2x-3 are shown. what’s the missing number

aliya0001 [1]

Answer:

its 6

Step-by-step explanation:

i calculated but threw in trash by an accident

8 0

3 years ago

You must be at least 4 feet tall to go on the ride

Sloan [31]

91038482949394738393858 thank you

5 0

3 years ago

Read 2 more answers

A random variable x takes four possible values, 0, 2, a, and b, where a and b are unknown numbers. if pr[x = 0] = 0.2, pr[x=2] =

Alexus [3.1K]

$\displaystyle\sum_{x\in\{0,2,a,b\}}\mathbb P(X=x)=1$
$\mathbb P(X=0)+\mathbb P(X=2)+\mathbb P(X=a)+\mathbb P(X=b)=1$
$0.2+0.4+0.3+\mathbb P(X=b)=1$
$\implies\mathbb P(X=b)=0.1$

$\mathbb E(X)=\displaystyle\sum_{x\in\{0,2,a,b\}}x\mathbb P(X=x)=2.8$
$0\mathbb P(X=0)+2\mathbb P(X=2)+a\mathbb P(X=a)+b\mathbb P(X=b)=2.8$
$0.8+0.3a+0.1b=2.8$
$0.3a+0.1b=2$

$a+b=6\implies0.3a+0.1b=0.2a+0.1(6)=2$
$0.2a+0.6=2\implies0.2a=1.4\implies a=7$

7 0

3 years ago

Please answer both

iogann1982 [59]

Every function is a relation because the numbers have relationships but not every relation is a function because for it to be a function there has to be one y fo every x if any x(input) has more than one y(output) it's not a function

3 0

4 years ago