Commutative property of addition is when 3+9=12 and 9+3=12.
Answer:

Step-by-step explanation:
Given
Original


New

Required
Determine the new length (L2)
Since the original photographs was blown up; the original and the new photographs would have the same ratio
i.e.

and

Equate both ratios

Rewrite as fraction

Substitute values for L1, H1 and H2

Multiply both sides by 4






The new length must be 
The best approximation for the measure of angle ABC is 58.3° ⇒ 3rd answer
Step-by-step explanation:
Let us revise the trigonometry ratios in the right triangle ABC, where B is the right angle, AC is the hypotenuse, AB and BC are the legs of the triangle
The trigonometry ratios of the angle BAC, the opposite side to this angle is BC and the adjacent side to it is AB are
In Δ ABC
∵ ∠ BCA is a right angle
∴ The hypotenuse is AB
∵ The adjacent side to ∠ABC is BC
∵ AB = 20 centimeters
∵ BC = 10.5 centimeters
- Use cosine ratio to find the measure of the angle because you
have the adjacent side of the angle ABC and the hypotenuse
∵ m∠ABC is x
∵ 
∴
- To find x use the inverse of cos(x)
∵
∴ x = 58.33°
∴ m∠ABC = 58.33°
The best approximation for the measure of angle ABC is 58.3°
Learn more:
You can learn more about the trigonometry ratios in brainly.com/question/4924817
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Wants to find how much money he will spend for a number of ride tickets, h, he purchases
he gets into an amusement park by paying a fee of 10 dollars
each ride is 7 dollars
so his looss is -7h-10