1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Katarina [22]
3 years ago
12

Anyone help with these 2 question?

Mathematics
1 answer:
ICE Princess25 [194]3 years ago
8 0

Step-by-step explanation:

1.√2×(-2√9)×(-√2)

= -2×(-2×3)

=12 option a

2. √5×√15×√75

= √5×(√3√5)×(5√3)

= 5×3×5

=75 option b

You might be interested in
9sin(2x) sin (x) = 9cos(x)
nikdorinn [45]

Answer:

\sin(2x)  = 2 \sin(x)  \cos(x)  \\ 9( 2 \sin(x)  \cos(x) ) \sin(x)  = 9 \cos(x)  \\ 18 { \sin}^{2} (x)9 \cos(x)  - 9 \cos(x)  = 0 \\ 9 \cos(x) (2{ \sin}^{2} (x) - 1) = 0 \\ 9 \cos(x) = 0 \: or \: 2{ \sin}^{2} (x) - 1 = 0 \\  \sin(x)  =  \pm \frac{1}{ \sqrt{2} }  \\  \cos(x)  = 0 \\ x =  { \cos}^{ - 1} (0) \\ x =  \frac{ \pi}{2}  = 90 \degree \\ x = \frac{ \pi}{2} + 2\pi \: n \:  \forall \: n \:  \in \:  \Z  \\ = 90 \degree +  360\degree\: n \:  \forall \: n \:  \in \:  \Z \\  =  \pm\frac{ \pi}{4}  \pm2\pi \: n \:  \forall \: n \:  \in \:  \Z \\ x =  \pm45\degree  \pm 360\degree\: n \:  \forall \: n \:  \in \:  \Z

8 0
2 years ago
The numerical value of the variance a. is negative if the mean is negative. b. is always larger than the numerical value of the
Snowcat [4.5K]

Answer:

Step-by-step explanation:

Variance is the sum of squares of all items x from mean.  i.e

Variance = \Sigma (x-xbar)^2

Being the sum of squares variance can never be negative irrespective of mean being negative.

Std deviation is the square root of variances.  This will thus be less than variance if variance >1 other wise std deviation will be bigger than variance.

Hence option d is right.

8 0
3 years ago
Mick paid 2.94 in sales tax on an item that costs 42 dollars before tax. At that rate how much would he pay in sales tax for an
djverab [1.8K]
Mick would pay $4.06 in sales tax for an item that costs $58.00.

This can be found by working backwards in the problem. By dividing that sales tax paid (2.94) by the dollars before tax (42), you get a percentage that should equal the percentage of the total paid for tax.

2.94 ÷ 42 = 0.07

This means that the sales tax is 7% of the total prior to tax. So we'd then multiply our dollars (58) with the sales tax in decimal form (0.07)

58.00 × 0.07 = 4.06

Hope I could help!
4 0
3 years ago
Read 2 more answers
To find the percent of a discount, ______________.
Neporo4naja [7]
The correct and best answer would be letter B. To find the percent of a discount, you have to find or solve for the percent of increase from the new price to the original price. This is because you usually have the new price being given to you so you compare it with the old price to know the percent discount.
4 0
2 years ago
Owen knows he only has three pencils in his backpack, and they are yellow. He reaches into his backpack without looking and take
Tasya [4]
The probability is 100% because all pencils were yellow
4 0
3 years ago
Read 2 more answers
Other questions:
  • If 40% of a number is 80 what is 25% of that number?
    7·1 answer
  • Kristie has taken five tests in science class. The average of all five of Kristie's test scores is 94. The average of her last t
    15·1 answer
  • Help me please!!
    7·1 answer
  • Number 1. Write an Equation for this situation Amanda is training for a marathon she sets the pace so that every mile takes eigh
    14·1 answer
  • PLEASE HELP!!! DUE TODAY
    10·1 answer
  • Select all that apply.
    10·2 answers
  • The next model of sports car will cost 11 9% more than the current model. The current model costs $18,000 How much will the pric
    14·1 answer
  • Thesaurus entries:
    8·1 answer
  • Which of the following is statement is TRUE about mixed numbers?
    7·1 answer
  • Use the angle and the given side to solve for the value of x. Round to the nearest tenth.57°6.х
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!