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harina [27]
3 years ago
13

Factorise this fully x^2+2x-15

Mathematics
1 answer:
natka813 [3]3 years ago
7 0
The answer to the question

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Help me simplify this radical
Lady_Fox [76]

Answer:

5\sqrt{3} b^{5}

Step-by-step explanation:

\sqrt{25}×3 b^{10}

\sqrt{5^2}×3 b^{10}

\sqrt{5^2}    \sqrt{b^2}   \sqrt{3}

5b^{5} \sqrt{3}

5\sqrt{3} b^{5}

6 0
2 years ago
What would the inequality be if there are fewer than 10 yards of fabric left?
jasenka [17]
If i am understanding the question correctly, x<10
8 0
4 years ago
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2. Cement has a density of 3.0 g/cm3. You must pour a cement walkway with the
Anon25 [30]

For this case we have to by definition:

d = \frac {M} {V}

Where:

d: It is the density

M: It's the mass

V: It is the volume

According to the data we have to:

d = 3.0 \frac {g} {cm ^ 3}

On the other hand we have that 1 meter is equivalent to 100 centimeters. Thus the measurements of the walkway are:

600 cm long, 100 cm wide and 10 cm thick. Looking for the volume we have:

V = 600 * 100 * 10\\V = 600,000 cm ^ 3

According to the formula we have:

M = d * V\\M = 3.0 \frac {g} {cm ^ 3} * 600,000 cm ^ 3\\M = 1,800,000g

Thus, the mass of the walkway is 1,800,000g

Answer:

1,800,000g

7 0
4 years ago
A coffee mixture has beans that sell for $0.20 a pound and beans that sell for $0.68. If 120 pounds of beans create a mixture wo
atroni [7]
Let x be the number of pounds of the $1.35 beans. The cost of those beans is $1.35 * x, or 1.35x. 
<span>Let y be the number of pounds of the $1.05 beans. The cost of those beans is $1.05 * y, or 1.05y. </span>
<span>We know that 120 pounds of the mix sells for $1.15/pound, for a total of 120 * 1.15 = $138. </span>

<span>x + y = 120 </span>
<span>1.35(x) + (1.05)y = 138 </span>

<span>We can rewrite the first as </span>
<span>x = -y + 120 </span>

<span>Now we can substitute (-y + 120) in for (x) in the second equation, because we just proved they're equal. </span>

<span>1.35(x) + 1.05(y) = 138 </span>
<span>1.35(-y + 120) + 1.05y = 138 </span>
<span>-1.35y + 162 + 1.05y = 138 </span>
<span>-0.3y + 162 = 138 </span>
<span>-0.3y = -24 </span>
<span>y = 80 </span>

<span>And since x + y = 120, that means x = 40. </span>

<span>Check: </span>
<span>40 pounds of x at $1.35 costs 40 * 1.35, or $54. </span>
<span>80 pounds of y at $1.05 costs 80 * 1.05, or $84. </span>
<span>Do those add up to our target total, according to the question, of 120 * 1.15 = $138? </span>
3 0
3 years ago
WILL MARK BRAINLIEST!!!<br><br> given j(x)= 7x+5 and k(x)=2x+1<br><br> What is (j-k)(1)
Semmy [17]

Answer:

7 \times 1 + 5 - 2 \times 1 - 1 = 7 + 5 - 2 - 1 = 12 - 3 = 9

5 0
3 years ago
Read 2 more answers
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