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2 years ago

Can someone do these 10 questions for me you only have to choose the correct letter please

Mathematics

1 answer:

Sergio039 [100]2 years ago

6 0

I WOULD BUT I DONT KNOW!

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Help is needed please

enyata [817]

Answer:

28.8

Step-by-step explanation:

23+2x+3x+13=180 simplify the left side

5x+36=180 subtract 36 from both sides

5x=144 divide both sides by 5 to isolate the variable

x=28.8

8 0

2 years ago

Hannah is asked to convert the number 0.00000305 to scientific notation. Her answer is 3.05 × 106. Which statement best describe

Sophie [7]

Answer: if u mean 3.05 x 10^6 then Hannah is correct.

Step-by-step explanation:

With scientific notations you should have one number on the left side of the decimal so 3.05 is correct and since you move the decimal to the right six times you would get 3.05 * 10^6

6 0

3 years ago

Write an algebraic expression for the word expression.

kolbaska11 [484]

Answer:

3 + x

Step-by-step explanation:

Sum means to add, so you would just add 3 and x (since they haven't given an actual number and only a variable).

3 0

2 years ago

Write the expression using a single exponent. (-3)^9 (-3)^4

Jet001 [13]

Answer:

(-3)^13

Step-by-step explanation:

(-3) is a constant value so there is no change

You must add 4 and 9 together to create one exponent of 13

6 0

2 years ago

Read 2 more answers

1. Jane saved up 20 coins, all nickels and

kompoz [17]

Answer:

10 nickels and 10 quarters

Step-by-step explanation:

Given

Number of coins: 20

Vaiue of coins = $3.00

Required

Number of Nickels and Quarters;

<em>Let N =Nickels and Q =Quarters</em>

The total coins is represented as:

$N + Q = 20$

1 nickel is equivalent to $0.05 and 1 quarter is equivalent to $0.25; So

$0.05N + 0.25Q = 3$

Make N the subject of formula in the first equation

$N = 20 - Q$

Substitute this in the second equation

$0.05(20 - Q) + 0.25Q = 3$

$1 - 0.05Q + 0.25Q = 3$

Collect like terms

$-0.05Q + 0.25Q = 3 - 1$

$0.2Q = 2$

Multiply both sides by 5

$5 * 0.2Q = 2 * 5$

$Q = 10$

Recall that N = 20 - Q

$N = 20 - 10$

$N = 10$

6 0

2 years ago