3 years ago

Which expression is equivalent to 3a+9a+7b-b

Mathematics

1 answer:

LuckyWell [14K]3 years ago

3 0

Answer:

12a+6b

Step-by-step explanation:

3a+9a+7b-b

Combine like terms

3a+9a +7b-b

12a +6b

You might be interested in

david counts the quarters in his change jar. He has 24 more quarters than his brother Rob. if r is the number of quarters Rob ha

denis-greek [22]

Rob has R quarters, and David has R + 24 or 24 more than rob, so together they have 2R+24

8 0

4 years ago

Convert the general form of the circle given into standard form.

Semmy [17]

$The\ standard\ form\ of\ the\ circle:\\\\(x-a)^2+(y-b)^2=r^2\\\\where\\(a;\ b)\ are\ the\ coordinates\ of\ a\ center\ of\ the\ circle\\r\ is\ a\ radius\ of\ the\ circle\\------------------------$

$2x^2+2y^2-20x-8y+50=0\ \ \ \ |divide\ both\ sides\ by\ 2\\\\x^2+y^2-10x-4y+25=0\\\\x^2-10x+y^2-4y=-25\\\\x^2-2x\cdot5+y^2-2y\cdot2=-25\\\\\underbrace{x^2-2x\cdot5+5^2}_{(*)}-5^2+\underbrace{y^2-2y\cdot2+2^2}_{(*)}-2^2=-25\\(x-5)^2-25+(y-2)^2-4=-25\\\\(x-5)^2+(y-2)^2-29=-25\\\\(x-5)^2+(y-2)^2=-25+29$

$\boxed{(x-5)^2+(y-2)^2=4}\\\\the\ center:(5;\ 2)\\the\ radius:r=\sqrt4=2$

$(*)\ (a-b)^2=a^2-2ab+b^2$

8 0

4 years ago

Read 2 more answers

Plz answer!!!!!!! ASAP!!!!!!!!!!!

Fed [463]

Answer:

814

Step-by-step explanation:

A=2(wl+hl+hw)

=2((11×22)+(5×22))+(5×11))

= 814

5 0

3 years ago

At the moment a certain medicine is injected, its concentration in the bloodstream is 120 milligrams per liter. From that moment

Jobisdone [24]

Answer:

C(t)= D-(30Dt/100)

Step-by-step explanation:

C(t)= 120-(30*120*1h)/100 C(t)=84

C(t)= 120-(30*120*2h)/100 C(t)=48

C(t)= 120-(30*120*3h)/100 C(t)=12

5 0

4 years ago

Please help with these problems.

DiKsa [7]

13 should be b and
14 is a because geometric mean to have a common ratio

7 0

3 years ago