So you do
distribute
a(b+c)=ab+ac
9(x+5)=9x+9 times 5=9x+45
7(x-3)=7x+7 times -3=7x-21
so now we have
9x+45+7x-21
group like terms
9x+7x+45-21
add
16x+24
simplified is 16x+24
Answer:
is it 82 degrees?
Step-by-step explanation:
Answer:
4. 23
4. 206
5. 75 ft
7. 6 sections
8. 6 families
Step-by-step explanation:
4. 3x + 5 is the same thing as 3 x 6 + 5 so it equals to 23
4. x to the power of 3 - 10 is equal to 6 to the power of 3 - 10 so it equals to 206
5. Formula for area of triangle = 1/2 x base x height
So, it's 1/2 x 10 x 15 = 75
7. 3/4 ÷ 1/8 = 6 (Trick: When dividing fractions, make sure to flip the fraction for the 2nd one and leave the 1st one as the same. After that, multiply them together)
8. 3 families have 4-5 pets, 2 families have 6-7 pets and 1 family have 8-9 pets. At least 4 pets means 4 pets and above. So 3 + 2 + 1 = 6 families.
Answer:
Set membership x ∈ X means x is an element of the set X. (Non-membership is written x ∈ X.) Set inclusion X ⊆ Y means every element of X is an element of Y ; X is a subset of Y .
Step-by-step explanation:
Carry on learning
Answer:
2x+y=5;14x-7y=35
{x,y} = {5/2,0}
System of Linear Equations entered :
[1] 2x + y = 5
[2] 14x - 7y = 35
Steps:
// Solve equation [1] for the variable y
[1] y = -2x + 5
// Plug this in for variable y in equation [2]
[2] 14x - 7•(-2x+5) = 35
[2] 28x = 70
// Solve equation [2] for the variable x
[2] 28x = 70
[2] x = 5/2
// By now we know this much :
x = 5/2
y = -2x+5
// Use the x value to solve for y
y = -2(5/2)+5 = 0
Solution :
{x,y} = {5/2,0}
