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Simora [160]
3 years ago
12

Find 85^2 using mental math. a. 5,625 b. 7,225 c. 6,825 d. 6,400

Mathematics
2 answers:
Nat2105 [25]3 years ago
7 0
B bro 7,225. 85x85 should do the trick:)
RSB [31]3 years ago
5 0

Answer:

7,225

Step-by-step explanation:

find 85^2 using mental math

85^2 = 85 * 85

85 can be written as 80 +5

(80+5)(80+5)

Multiply each term inside the parenthesis

Multiply 80 with 80 +5 and then we multiply 5 with 80 +5

It becomes

6400 + 400+400+ 25

Now we add all the numbers

7,225

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If it’s to the nearest tenth it’s 1.4 if it’s the nearest hundredth 1.42
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3 years ago
Carlos made a wooden box in his scout group. The box was 8 inches high, 11 inches wide and 15 inches long. Which expression will
Mamont248 [21]

Answer:

D. 8 x 11 x 15

Step-by-step explanation:

lenght times width times height  is how you find volume

8 0
3 years ago
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If 1/4 gallons of water are enough to fill 7/10 of the pool how much water is nessacary to fill in the entire pool
anyanavicka [17]
<h3>Answer:  5/14 gallons</h3>

============================================================

Work Shown:

1/4 = 0.25

7/10 = 0.70 = 70%

We are told that 0.25 gallons of water fills 70% of the pool

We want to find how many gallons of water (call it x) are needed to fill 100% of the pool.

Set up the proportion below and solve for x

(0.25 gallons)/(70% filled) = (x gallons)/(100% filled)

0.25/70 = x/100

0.25*100 = 70x ....... cross multiply

25 = 70x

70x = 25

x = 25/70

x = (5*5)/(5*14)

x = 5/14 gallons

----------------------------------------

An alternate method:

1/4 gallons = 7/10 pools filled

(10/7)*(1/4 gallons) = (10/7)*(7/10 pools filled)

(10*1)/(7*4) gallons = (10*7)/(7*10) pools filled

10/28 gallons = 1 pool filled

(5*2)/(14*2) gallons = 1 pool filled

5/14 gallons = 1 pool filled

In the second step, I multiplied both sides by 10/7 so that the "7/10" turns into "1".

----------------------------------------

Yet another alternate method:

1/4 = 10/40

7/10 = 28/40

We need 10/40 gallons of water to fill 28/40 of one pool. We can multiply both fractions by 40 to indicate that 10 gallons of water will fill up 28 pools.

So we have this ratio

10 gallons : 28 pools

Dividing both parts by 28 tells us how many gallons are needed for one pool

10 gallons : 28 pools

10/28 gallons : 28/28 pools

10/28 gallons : 1 pool

5/14 gallons : 1 pool

8 0
3 years ago
On a piece of paper, graph f(x) = 4 x (0.5)^x
tangare [24]

The complete question is

"On a piece of paper, graph f(x) = 4. (0.5)^x Then determine which answer choice matches the graph you drew."

The given function is an exponential function. The graph of option C is the correct answer.

<h3>What are exponential functions?</h3>

When the expression of function is such that it involves the input to be present as an exponent (power) of some constant, then such function is called exponential function.

There usual form is specified below. They are written in several such equivalent forms.

For example, y^x

, where a is a constant is an exponential function.

The function is given as

f(x) = 4. (0.5)^x

AS we can see that the given function is an exponential function.

Thus, the graph of option C is the correct answer.

Learn more about exponential here:

brainly.com/question/2193820

#SPJ1

6 0
1 year ago
Problem solving this
polet [3.4K]

Answer:x=20

Im pretty sure thats the answer




7 0
3 years ago
Read 2 more answers
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