If sin of beta = 4/7, what is cos of beta?

Answers

Answer 1

Answer: sin²β +cos²β=1
cos²β=1-sin²β
cos²β=1-(4/7)²
cos²β=1-16/49=49/49-16/49=33/49
cosβ=√33/√49=√33/7

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Almira earns 50$ an hour. how much does she earn in 6 hours

Answers

If it is $50 per hour, and she works for 6 hours you time 50 by 6 which equals 300

How do you round 18.194 to the tenths hundredths and ones

Answers

If you want to round it to the tenths it will be 18.200 because if the number is greater than 5 ( 9) then u round up 1 number. If it was not a 9 and it was for example 2, it will be 18.190. If it is less than 5 then u round to 0

Which of these is the algebraic expression for "nine less than some number?"9 / k
k / 9
9 − k
k − 9

Answers

9 less than means decrease by 9 or minus 9 or -9
9 less than some number (k) means k-9

las one

Its either k-9 or 9-k I would go with k-9

Enter the value of 18 + t2 - 5x3 when t = 4

Answers

Answer:

Step-by-step explanation:

If t=4

18+t2 would equal “26”

Then 26x3 would be “78”

Final answer:

When t = 4, the part of the equation 18 + t^2 evaluates to 34. We cannot compute - 5x^3 without the value of x.

Explanation:

The subject of the question is Mathematics, more specifically, the topic of algebraic expressions. Given an equation, 18 + t^2 - 5x^3, you'd like to find the value when t = 4. However, the value of x is not provided which is required to fully solve this expression. If we ignore the variable x, and only substitute the value of t in the expression, it will be:

18 + 4^2 = 18 + 16 = 34.

So, when t = 4, the part of the equation 18 + t^2 evaluates to 34. However, we cannot calculate - 5x^3 without having the value of x.

Learn more about Algebraic Expressions here:

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1/10 of 700
1/5 of 700

Answers

$(1)/(10)*700= (700)/(10) = 70 \n \n (1)/(5) *700= (700)/(5) =140$

1/10=0.1
700x0.1=70

1/5=0.25
700x0.2=140

There are 10 marbles in a bag, and the marbles are either red or blue. Eric will randomly choose two marbles from the bag, without replacing the first one. If the probability of both marbles' being red is 2
15, how many RED marbles are in the bag?

Answers

Let the number of red marbles be r. Now we can write the equation:
$(r)/(10)*(r-1)/(9)=(2)/(15)$
Rearranging the above equation and simplifying gives the quadratic:
$r^(2)-r-12=0$
which factorizes to:
(r - 4)(r + 3) = 0
Therefore r = 4. there are 4 RED marbles in the bag.

Answer:

Step-by-step explanation:

BECAUSE.

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