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Ainat [17]
3 years ago
14

I need the answer to 1 and 2

Mathematics
1 answer:
alina1380 [7]3 years ago
8 0

Answer:

Shah DNS

Step-by-step explanation:

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Suppose u=<2,−1> and v=<1,−8> are two vectors that form the sides of a parallelogram. Then the lengths of the two di
tigry1 [53]
| u | = √(2² + (-1²)) = √5
| v | = √ ( 1² + (-8)² = √65
cos (u,v) = ( u * v ) / (| u | * | v |) =
 (2 * 1 + ( -1 ) * ( - 8 )) / √5 √ 65 = (2 + 8) / √5 √65 = 10 / (√5 √ 65 )
The length of a larger diagonal:
d 1² = | u |² + 2 |u| |v| + | v |² = 5 + (2 √5 √65 * 10 / √5 √65 )+65
d 1² = 70 + 20 = 90
d 1 = √ 90 = 3√10
d 2² = 70 - 20 = 50
d 2 = √50 = 5√2
Answer:
The lengths of the diagonals are: 3√10 and 5√2 .
8 0
3 years ago
What is the value of the expression 6 3/4 (−11.5)
notka56 [123]

Answer:

-75.9

Step-by-step explanation:

5 0
3 years ago
Put the following list of numbers in ascending order. 1.2, 0, -0.4,-2.6,0.8
xz_007 [3.2K]

Answer:

-2.6, -0.4, 0, 0.8, 1.2

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Which of these numbers is classified as both real and rational 17 squared 23 squared 9 squared 2 squared
vovangra [49]
All of the given numbers are both real and rational, and so all of their respective squares are also real and rational.
3 0
3 years ago
A student scored 66 points on his Psychology 101 midterm. If the average of his midterm and final must be between 78 and 90 incl
masha68 [24]

Answer:

range of scores on final exam student get  B is 90 to 100

Step-by-step explanation:

given data

Psychology 101 score = 66

average of his midterm = between 78 and 90

maximum = 100 points

to find out

range of scores on final exam student get  B

solution

we consider here lowest marks need in final = x

so average at two marks should be

equation is  

average marks = 0.5 × ( mid term marks + final marks )      .................1

put here value

78 = 0.5 ×  ( 66 + x )

x = 90

and

90 = 0.5 ×  ( 66 + x )

x = 114

so range 90 to 114

but maximum marks is 100 so

range of scores on final exam student get  B is 90 to 100

5 0
3 years ago
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