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Goryan [66]
2 years ago
6

2b+ 9r use b=2 and r=7

Mathematics
2 answers:
VikaD [51]2 years ago
8 0

Answer:

67

Step-by-step explanation:

2b+9r

2(2)+9(7)

4+63

67

belka [17]2 years ago
6 0

Answer:

67

Step-by-step explanation:

2(2)+9(7)

4+63=67

Have a great day

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This morning, the temperature rose 2 degrees in 2/3 of an hour at what rate did the temperature rise per hour
insens350 [35]

Answer:

3 degrees per hour

Step-by-step explanation:

2 degrees in 2/3 of an hour

2/2 = 1

1 degree in 1/3 of an hour

1*3 = 3

3 degrees in 1 hour

5 0
3 years ago
HELP PLEASE! i don't understand this well so if someone could please list the answer and an explanation that would be great :)
Sliva [168]

Answer: 44 I believe.

Step-by-step explanation: Please mark Brainiest if I'm right.

6 0
3 years ago
Factorise -75ab² - 15ac
Verdich [7]

Answer:

1)  -15·a·(5·b² + c)

2) h < 4

3) 4·x² - 9

4) 1792

5)  156°

6) 2t cm

7) 2·a·m·(2·m - 3)

8)  10 cm

9) 0.00051

10)  #47,250

11)  -10·p·q

12) 1.35 × 10⁻⁴

13) 320°

14) 20 cm

15) 12·x²·y²

16) 6.36 × 10⁵

17) 4 cm

18)  225°

19) 1034 cm²

20) 29

Step-by-step explanation:

1) The given expression is -75·a·b - 15·a·c

Which can be expressed as -15·a·(5·b² + c)

2) The height, h < 2 × 12/6 = 4

h < 4

3) (2·x - 3)·(2·x + 3) = 4·x² - 9

4) The selling price = 1.12 × 200 × 8 = 1792

5) The interior angle of a polygon is given by the relation;

(n - 2)×180/n for 15, we get;

(15 - 2)×180/15 = 156°

6) 2t cm

7) 4·a·m² - 6·a·m = 2·a·m·(2·m - 3)

8) Slant height = √(8² + 6²) = 10 cm

9) 51 × 10⁻⁵ = 0.00051

10) Cash price = #54,000 × (1 - 0.125) = #47,250

11) -40·p·q÷(-2)² = -10·p·q

12) 0.003 × 0.045 = 1.35 × 10⁻⁴

13) N40°W = 320°

14) The base diameter of the cylinder = √(4 × (700×π cm³/7)/π) = 20 cm

15) The LCM of 2·x²·y, 3·x·y² is 12·x²·y²

16) 636,000 = 6.36 × 10⁵

17) 1/3·π·r²·h₁ = π·r²·h₂

h₂/h₁ = 1/3·π·r²/( π·r²) = 1/3

h₂/12 =  1/3

h₂ = 12/3 = 4 cm, the height of the cylinder = 4 cm

18) The angle = 180 + 45 = 225°

19) The total surface area = 22/7×14²/4 +  22/7 ×14 × 20 = 1034 cm²

20) The number is 58/2 = 29.

4 0
3 years ago
8m^3 - 28m^2 + 6m - 21. You solve by factoring by grouping!!! quick please
Leya [2.2K]

Answer:

(2m - 7)(4 {m}^{2}  + 3)

Step-by-step explanation:

8m^3 - 28m^2 + 6m - 21 \\  = 4 {m}^{2} (2 {m}  - 7) + 3(2m - 7) \\  = (2m - 7)(4 {m}^{2}  + 3)

4 0
2 years ago
PLZ HELP EVERYTHING IS IN THE PIC.
jek_recluse [69]
Equation: (70 + 70*.05) + (580 + 580*.07) + (620 + 620*.10) = Total Spent

Solving for this gets you $1320.30.


7 0
3 years ago
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