Consider the linear transformation from R² to R² known as “rotation by -90 de- grees." The matrix of this transformation is Is this transformation onto? Is this transformation injective (one-to-one) ? What is the image of 1 [93] 0 [ 2 ] ² ? If there is an inverse for this transformation, what is the matrix of the inverse?

Can you please answer this and Simply it ? Thanks

Jenna drew this math diagram to justify her belief that = Explain what Jenna did wrong. (The answer is not that she didn't use a common denominator.)

For the following exercises, consider this scenario: Fred earns $40 mowing lawns. He spends $10 on mp3s, puts half of what is left n a savings account, and gets another $5 for washing his neighbor’s car.a.  Write the expression that represents the number of dollars Fred keeps (and does not put in his savings account). Remember the order of operations.b.  How much money does Fred keep?