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Lemur [1.5K]
3 years ago
9

Find the sum of (x^2+6x-5)+(2x^2+15)

Mathematics
1 answer:
defon3 years ago
5 0

Answer:

3x²+6x+10 is your answer

Step-by-step explanation:

(x^2+6x-5)+(2x^2+15)

open bracket

x²+6x-5+2x²+15

add or subtract common

3x²+6x+10

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How many 10 kobo coins are there in #9.90?
baherus [9]

Answer:

99

Step-by-step explanation:

1₦ = 100 k

₦9.90 =?

=990k

990/10=99

4 0
2 years ago
write an equation that describes the proportional relationship between the number of days in the number of weeks in a given leng
KatRina [158]

Answer:

Week 1 Day 7

Week 2 Day 14

Week 4 Day 28

Week 8 Day 56

Week 10 Day 70

Let x represent the number of weeks

Let y represent the number of days

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y = 14/7x

y = 2x

Step-by-step explanation:

6 0
3 years ago
8. Solve the system using elimination.<br> 3x - 4y = 9<br> - 3x + 2y = 9
olga nikolaevna [1]

Answer:

3x−4y=9 −3x+2y=9

Add these equations to eliminate x: −2y=18

Then solve−2y=18

for y: −2y=18 −2y −2 = 18 −2 (Divide both sides by -2)

y=−9

Now that we've found y let's plug it back in to solve for x.

Write down an original equation: 3x−4y=9

Substitute−9for y in 3x−4y=9: 3x−(4)(−9)=9

3x+36=9(Simplify both sides of the equation)

3x+36+−36=9+−36(Add -36 to both sides)

3x=−27 3x 3 = −27 3 (Divide both sides by 3) x=−9

Answer: x=−9 and y=−9

Hope This Helps!!!

4 0
3 years ago
Freida drove 50 miles in 15 minutes. At this rate, how many miles did she drive in 9
siniylev [52]

Answer:

30 miles

Step-by-step explanation:

The rate is distance /time

50 /15 =10/3 miles per hour

To find the distance traveled in 9 minutes, multiply the rate by the time

distance = 10/3 *9 = 30

30 miles

4 0
3 years ago
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Dmitriy789 [7]

Answer:

150

im pretty sure thats right

6 0
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