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Maksim231197 [3]
3 years ago
14

Factoring by grouping: what is 3x^2+2x-5

Mathematics
1 answer:
joja [24]3 years ago
3 0

Answer:

(x-1)(3x+5)

Step-by-step explanation:

3x^2+2x-5

3x^2+(5-3)x-5

3x^2+5x-3x-5

X(3x+5)-1(3x+5)

(x-1)(3x+5)

Answer is (x-1)(3x+5)

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lakkis [162]

2.05 I think if the question was just 4 1/10 ÷2

5 0
2 years ago
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A chef uses 3 3/4 pounds of semolina flour and 1 5/8 pound whole wheat flour for each batch of pasta she makes.one week she uses
Maurinko [17]
It is to be noted that for this item, we more concern of the pounds of flour. The number of batches is calculated by dividing the total mass of flour used by the amount per batch. That is,
                                              n = 86 lbs / (1 + 5/8 lbs/batch)
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4 0
3 years ago
Which expression has the same value as 12 − 6 ÷ 3
Juli2301 [7.4K]
Answer is a.
Due to BIDMAS/BODMAS
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a.
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2 years ago
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5 0
3 years ago
A piggy bank contains a total of 84 coins in nickels and quarters worth $12.80.
Kitty [74]

Let's make a system of equations to solve for this:

n + q = 84

0.05n + 0.25q = 12.80

where n = nickels and q = quarters.

---

Solve for n in the first equation by subtracting q from both sides.

n = 84 - q

---

Plug n into the second equation.

0.05(84 - q) + 0.25q = 12.80

Distribute 0.05 inside the parentheses.

4.2 - 0.05q + 0.25q = 12.80

Combine like terms.

4.2 + 0.2q = 12.80

Subtract 4.2 from both sides.

0.2q = 8.6

Divide both sides by 0.2.

q = 43

---

Plug 43 for q in the first equation.

n + (43) = 84

Subtract 43 from both sides.

n = 41

---

There are 41 nickels and 43 quarters in the piggy bank. ✅

8 0
3 years ago
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