Brainliest plus 50 points.
do question nine. note that this is simultaneous equations and show full working out. hint, the answer is x equal 39 degrees and y equal 52 degrees and angle k is 90 degrees.

see explanation

Step-by-step explanation:

Since KL = KM then the triangle is isosceles and the 2 base angles are congruent, that is

∠KLM = ∠KML, thus

y - 9 = x + 4 (add 9 from both sides )

y = x + 13 → (1)

The sum of the 3 angles in the triangle = 180°, thus

x + 4 + y - 9 + x + y + 3 = 180

2x + 2y - 2 = 180 ( add 2 to both sides )

2x + 2y = 182 → (2)

Substitute y = x + 13 into (2)

2x + 2(x + 13) = 182 ← distribute and simplify left side

2x + 2x + 26 = 182

4x  + 26 = 182 ( subtract 26 from both sides )

4x = 156 ( divide both sides by 4 )

x = 39

Substitute x = 39 into (1)

y = 39 + 13 = 52

Hence

∠K = x + y + 3 = 39 + 52 + 3 = 94°

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons