3 years ago

Solve each using mental math.

Mathematics

1 answer:

S_A_V [24]3 years ago

6 0

T= 17

h= -7

x=12

b=9

Here’s all the answers.. may you put me as brainliest answerer? thanks !

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What is the sum of the probability of drawing a green marble and the probability of not drawing a green marble?

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the answer is 1 because

P(E)+P(E')=1

where E is the event and

E' is the complement of the event

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Goldbach’s conjecture states every even number greater than 2 can be written as the sum of two prime numbers which sum for 30 su

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4 2/9 as a decimal work shown

Xelga [282]

The Answer Is:4.222222

4 2/9 = 4 + 2/9

= 4/1 + 2/9

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3 years ago

Factorize: a^4+2xa³+a²x²-y^4

mart [117]

Answer:

(a^2+ax-y) (a^2+ax+y^2)

Step-by-step explanation:

a^4+2xa³+a²x²-y^4

(a^2+ax)^2-y^4

(a^2+ax-y) (a^2+ax+y^2)

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3 years ago

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Jessica has 48 coins, some of them are nickels and some are dimes. How many of each does she have if she has $3.25 total? 69 POI

Mrrafil [7]

Answer:

Nickels = 44.6

Dimes = 3.4

Step-by-step explanation:

We know that Jessica has 48 coins of which some are nickels and some are dimes so we can write it as:

n = amount of nickels

d = amount of dimes

$n+d=48$ --- (1)

We are to find the number of nickels and dimes if their total worth is $3.25.

Since a dime is worth 10¢ and a nickel is 5¢, so it should be:

$0.05n + 0.3d = 3.25$ --- (2)

From (1):

$n=48-d$

Substituting this value of $n$ in (2) to get:

$0.05(48-d) + 0.3d = 3.25$

$2.4-0.05d+0.3d=3.25$

$2.4+0.25d=3.25$

$0.25d=0.85$

$d=3.4$

Finding $n$ by substituting the value of $d$ :

$n=48-d$

$n=48-3.4$

$n=44.6$

6 0

3 years ago

Read 2 more answers

Solve each using mental math. ​

Solve each using mental math.