7.8 should be it, i am so sorry if its wrong hope it helps if its correct!
Answer:

Step-by-step explanation:
Let x represent the number of lawns Jacob mowed and y represent the number of dogs Sarah walked.
Jacob charges $20 each time he mows a lawn, then he earns $20x for x lawns mowed.
Sarah charges $10 each time she walks a dog, then she earns $10y for y dogs walked.
In total, they will earn $(20x + 10y). They need at least $2000 in order to go on a trip, then

Note that 
Answer:
42 (square root>) 10 + 51 (square root>) 5
Step-by-step explanation:
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Answer:
The quotient of a number to the fifth power and six.
Step-by-step explanation:
Step 1: Convert k⁵ into words
k⁵ = a number to the fifth power
Step 2: Convert / into words
/ = quotient
Step 3: Convert 6 into words
6 = six
Step 4: Combine
The quotient of a number to the fifth power and six.