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4 years ago

1. At the end of one school day a teacher had 17 crayons left. The teacher remembered

Mathematics

2 answers:

Vlad [161]4 years ago

5 0

Answer:

30 crayons

Step-by-step explanation:

Let x be the number of crayons he started with

gave out 14 crayons

x-14

Got 12 back

x-14+12

Gave out 11 after lunch

x-14+12 -11

This equals 17

x-14+12 -11 =17

Combine like terms

x-13 = 17

Add 13 to each side

x -13+13 =17+13

x = 30

Andru [333]4 years ago

5 0

Answer: 30

Step-by-step explanation:

For this problem work backwards. Start from 17 and add 14. You should get 31. Then subtract 12, which equals 19. Finally add 11 to 19, which equals 30. Basically you are doing the inverse operation to get your answer. Hope this helps!

More info so i can answer

8 0

3 years ago

2x^2-5xy-y^3 if x=-3, and y=-2

docker41 [41]

2x^2-5xy-y^3 if x=-3, and y=-2

2(-3)^2- 5(-3)(-2) -(-2)^3

=2(9) - 5(6) - (-8)

= 18 - 30 + 8

= -4

8 0

3 years ago

An object is experiencing an acceleration of 30 m/s2 while traveling in a

mixas84 [53]

Answer:

${ \tt{formular :}} \\ { \boxed{ \bf{centripental \: acceleration = \frac{ {v}^{2} }{r} }}} \\ \\ { \tt{30= \frac{ {3.7}^{2} }{r} }} \\ \\ { \tt{r = \frac{ {3.7}^{2} }{30} }} \\ \\ { \tt{radius = 0.456 \: meters}}$

5 0

3 years ago

Help me plz !!!!!!!!!!!!!!!

seropon [69]

Answer:

A. 2/3 book/hour

Step-by-step explanation:

rewrite the fractions as a decimal if it can make it easier for you (0.5 book/0.75 hours) then divide which is 2/3 book/hour

8 0

3 years ago

Thanks in advance for your help

densk [106]

Answer:

CA=P+2Q

Step-by-step explanation:

7 0

3 years ago