Help with 3 problems! Worth 23 points!!!

Mathematics

1 answer:

kicyunya [14]3 years ago

3 0

Answer:

1. b. the one with the v shape

2. b.

3. c.

Step-by-step explanation:

in every graph you should use the line test with is when you draw a line from top to bottom and if the line touches more then one dot or line on the graph it isnt not a function

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If 3x+2=11 then x= ?

leonid [27]

Answer:

X=3

Step-by-step explanation:

What you have to do is minus 2 from 11 and you get 9

Now divide 3 into 9 and you get 3

x=3 you can also plug 3 for x to see if the equation is right

8 0

3 years ago

Read 2 more answers

Need help with math problem if do get 5 star

BlackZzzverrR [31]

Answer:

b) 200 square inches

Step-by-step explanation:

Area of a pentagon: A = 1/2 * 5(side)(apothem).

side: b = 10in
apothem: a = 8 in

A = 1/2 * 5(side)(apothem).

A = 1/2 * 5(10)(8).

A = 1/2 * 5(80).

A = 1/2 * 400

A = 200 square inches

7 0

3 years ago

Find the sum of the geometric series 40 + 40(1.005) + 40(1.005)^2 + ⋯ + 40(1.005)^11.

KiRa [710]

Answer:

The sum is 493.4

Step-by-step explanation:

In order to find the value of the sum, you have to apply the geometric series formula, which is:

$\sum_{i=1}^{n} ar^{i-1} = \frac{a(1-r^{n})}{1-r}$

where i is the starting point, n is the number of terms, a is the first term and r is the common ratio.

The finite geometric series converges to the expression in the right side of the equation. Therefore, you don't need to calculate all the terms. You can use the expression directly.

In this case:

a=40

b= 1.005

n=12 (because the first term is 40 and the last term is 40(1.005)^11 )

Replacing in the formula:

$\frac{a(1-r^{n})}{1-r} = \frac{40(1-1.005^{12})}{1-1.005}$