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3 years ago

Please help me with this geometry question !!

Mathematics

1 answer:

mezya [45]3 years ago

3 0

Answer:

see explanation

Step-by-step explanation:

Given the rule (x, y ) → (x + 5, - y )

Add 5 to the original x- coordinate and make the y- coordinate negative.

(a)

(5, 3 ) → (5 + 5, - 3 ) → (10, - 3 )

(b)

(- 2, 7 ) → (- 2 + 5, - 7 ) → (3, - 7 )

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Which net matches the figure?

schepotkina [342]

In the first image, notice that the figure is a cube

also known as a "square prism."

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3 years ago

How many half-lives of radon-222 have passed in 11.46 days? If 5.2 × 10−8 g of radon-222 remain in a sealed box after 11.46 days

Svetach [21]

Answer:

(i) Approximately 3 half lifes

(ii) $4.21\times 10^{-7}\text{ g}$

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So, the number of half life in 11.46 days = $\frac{11.46}{3.8}$ ≈ 3

(ii) Since, the half life formula is,

$N=N_0 (\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}}$

Where,

$N_0$ = initial quantity,

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$t_{\frac{1}{2}}$ = half life of the quantity,

Given,

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7 0

4 years ago

I need help on this

Tasya [4]

Answer:

TOTAL TAX IS: $19.25

TOTAL PRICE IS: $294.25

MONEY LEFT IS: $135.75

Step-by-step explanation:

First, you do a proportion:

?/275 = 7/100

the ?/275 represents how much money in $275

the 7/100 represents 7% (7 hundredths)

then you cross multiply:

275 x 7 = 1925

then you divide:

1925 divided by 100 = 19.25

So $19.25 is the tax amount.

To get the total price, you add:

Tax ($19.25) + Cost($275) = $294.25

$294.25 is the total amount that Anna has to pay.

To get what Anna has left over, you subtract:

Has($430) - Spend($294.25) = $135.75

Anna has $135.75 left.

I hope this helped you a lot!

Bri <3

3 0

3 years ago