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3 years ago

Just answer number 6 plz I will give you brainliest for correct answer and explaination

Mathematics

2 answers:

snow_lady [41]3 years ago

6 0

Answer:

Step-by-step explanation:

We can use a proportion to solve for the current when light intensity is 1000.

900/90 = 1000/x

We will cross multiply these.

900x = 90000

Divide by 900

x = 100

We would expect the current to be 100 when light intensity is 1,000, suggesting that only 10% of light intensity is actually usable current.

Vadim26 [7]3 years ago

4 0

Answer:

It seems like you go the answer right which is 100

Step-by-step explanation:

Every light intensity can be divided by 10 in order to get the current.

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Find the sum of the series given in sigma notation.

Kryger [21]

Answer:

Option b is correct 175

Step-by-step explanation:

n = 7

k = 6

3k -2 ------1

put k = 6 in above eq. for finding first term

a1 = 3(6) - 2 = 18 - 2 = 16

put k = 7 in above eq. for finding first term

a2 = 3(7) - 2 = 21 - 2 = 19

a3 = 3 (8) - 2 = 24 - 2 = 22

16, 19 , 22, ... //Arithmetic series formation

a1 = 16 , a2 = 19

d = a2 - a1 = 19 - 16 = 3 //Difference of first two terms

Using sum forumula for arithmetic series

sum = $\frac{n}{2}(2a1 + (n-1)d)$

= $\frac{7}{2}(2a1 + (7-1)d)$

= $\frac{7}{2}(2(16) + (6)3)$

= $\frac{7}{2}(32 + 18)$

= $\frac{7}{2}(50)$

= 7 * 25

= 175

4 0

3 years ago

Solve for y: 4x - 5y = 23

Eddi Din [679]

Answer:

4x - 5y = 0

Step-by-step explanation:

First off all you do it like this

4x - 5y = 23

4x - 5y - 23 = 23 - 23

4x - 5y - 23 = 0

8 0

3 years ago

Read 2 more answers

What is being done to the variable in the equation 3 + g = -9?

almond37 [142]

Answer:

its A

Step-by-step explanation:

not gonna explain it cause I dont have to ._. plus it wasnt that hard

4 0

3 years ago

Draw models of 2 pizzas with a different

klemol [59]

Answer:

here

Step-by-step explanation:

6 0

3 years ago

Simplify completely and find the restrictions on the variable.

MatroZZZ [7]

Answer:

$\displaystyle \frac{x + 2}{x + 9}, \ x \neq -9, \ 12$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Algebra I

Terms/Coefficients
Factoring

Algebra II

Discontinuities
Domain Restrictions

Step-by-step explanation:

Step 1: Define

$\displaystyle \frac{x^2 - 10x - 24}{x^2 - 3x - 108}$

Step 2: Simplify

[Fraction] Factor numerator: $\displaystyle \frac{(x - 12)(x + 2)}{x^2 - 3x - 108}$
[Fraction] Factor denominator: $\displaystyle \frac{(x - 12)(x + 2)}{(x - 12)(x + 9)}$
[Fraction] Divide: $\displaystyle \frac{x + 2}{x + 9}$

We know that x cannot equal -9 because we would get a divide by 0 (undefined) error. We also know that x cannot equal 12 because it was canceled out when simplifying.

7 0

3 years ago