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3 years ago

Helppppp me nooooooooooooooooooooooooooooooooooooo

Mathematics

2 answers:

laila [671]3 years ago

5 0

Answer:

I want brainliest

Step-by-step explanation:

7.6 x 8 = 60.8

so the answer is either b or c

7.6 per hour

7.6h

makes the answer b

NARA [144]3 years ago

3 0

B. is the answerrrrr

yayyyyyyyyyyyyyyyy

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- Trevon invested $1.500 in an account with an interest rate of 4.25%. If he plans to retire in 18 1/2 years, how much total wil

gizmo_the_mogwai [7]

Answer:

I=PRT is the formula

Step-by-step explanation:

Principal is $1,500. The interest rate is 4.25% and the time is 18.5 years.

That's all i know good luck

5 0

3 years ago

DIscrete Math

Daniel [21]

Answer:

Step-by-step explanation:

As the statement is ‘‘if and only if’’ we need to prove two implications

$f : X \rightarrow Y$ is surjective implies there exists a function $h : Y \rightarrow X$ such that $f\circ h = 1_Y$ .
If there exists a function $h : Y \rightarrow X$ such that $f\circ h = 1_Y$ , then $f : X \rightarrow Y$ is surjective

Let us start by the first implication.

Our hypothesis is that the function $f : X \rightarrow Y$ is surjective. From this we know that for every $y\in Y$ there exist, at least, one $x\in X$ such that $y=f(x)$ .

Now, define the sets $X_y = \{x\in X: y=f(x)\}$ . Notice that the set $X_y$ is the pre-image of the element $y$ . Also, from the fact that $f$ is a function we deduce that $X_{y_1}\cap X_{y_2}=\emptyset$ , and because $f$ the sets $X_y$ are no empty.

From each set $X_y$ choose only one element $x_y$ , and notice that $f(x_y)=y$ .

So, we can define the function $h:Y\rightarrow X$ as $h(y)=x_y$ . It is no difficult to conclude that $f\circ h(y) = f(x_y)=y$ . With this we have that $f\circ h=1_Y$ , and the prove is complete.

Now, let us prove the second implication.

We have that there exists a function $h:Y\rightarrow X$ such that $f\circ h=1_Y$ .

Take an element $y\in Y$ , then $f\circ h(y)=y$ . Now, write $x=h(y)$ and notice that $x\in X$ . Also, with this we have that $f(x)=y$ .

So, for every element $y\in Y$ we have found that an element $x\in X$ (recall that $x=h(y)$ ) such that $y=f(x)$ , which is equivalent to the fact that $f$ is surjective. Therefore, the prove is complete.

3 0

3 years ago

Jessica has an account with a credit union. Her account earns 2.5% simple interest yearly. Exactly a year and a half ago, she op

elena55 [62]

Answer:

$22.5

Step-by-step explanation:

2.5% = .025

900 divided by 1.5 = 600

600 multiplied by .025 = 15

15 divided by .5 = 7.5

15 + 7.5 = 22.5

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3 years ago

F - 3/4 = 1/2 what is f?

Julli [10]

Answer:

f=5/4

Step-by-step explanation:

f=1/2+3/4

f=(1/2)×2+3/4

f=2/4+3/4

f=5/4

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3 years ago

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Oliga [24]

The common ratio is 2:1, or dividing by 2

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3 years ago

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