Help please. I’m confused. I’ll thank u

 See Below

Step-by-step explanation:

(b) Make a table of white ovals and black ovals.  You will notice that

white starts with 3 and adds 3 to each design → 3 + 3(d - 1) = 3d

black starts with 4 and adds 4 to each design → 4 + 4(d - 1) = 4d

white ovals when design = 30   --->    3d = 3(30) = 90

black ovals when design = 100   --->   4d = 4(100) = 400

white ovals when design = 50   --->   3d = 3(50) = 150

black ovals when design = 50   --->   4d = 4(50) = 200

                                                                  TOTAL = 350

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(c) Make a table of rods and squares.  You will notice that

rods start with 19 and add 12 to each design → 19 + 12(d - 1) = 12d - 7

squares start with 6 and add 4 to each design → 6 + 4(d - 1) = 4d + 2

rods when design = 15   --->    12d - 7 = 12(15) - 7 = 173

squares when design = 15   --->   4d + 2 = 4(15) + 2 = 62

x= -3

step-by-step explanation:

step 1: simplify brackets

4 - x - 1 = 6

step 2: simpilfy

3 - x = 6

step 3: subtract 3 from both sides

-x = 6 - 3

step 4: simpilfy 6 - 3

-x = 3

step 5: multiply both sides by -1

x = -3

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500