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3 years ago

Tens and ones combinations. 30 + ? + ? + ? / ? + ? = 92

Mathematics

2 answers:

BlackZzzverrR [31]3 years ago

6 0

The answer is 90 I hope it helps you

BlackZzzverrR [31]3 years ago

3 0

i know the answer its 90

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The speed of the current is 7 mph. The boat travels three times slower against the current than with the current. What is the sp

svlad2 [7]

Let
x--------> the speed of the boat in mph

we know that
going upstream the speed is x-7
going downstream the speed is x+7

let the distance be d
time to go upstream = d/(x-7) 
time to go downstream = d/(x+7)

time going upstream is 3 times going downstream
so
3d/(x+7) = d/(x-7) 
divide by d 
3/(x+7) = 1/(x-7) 
3x-21 = x+7 
2x = 28 
x = 14

the answer is
the speed of the boat in still water is 14 mph

7 0

3 years ago

What is the Area of 28in circle rounded to the nearest hundred

Slav-nsk [51]

Answer:

The circumference is similar to the perimeter in that it is the total length needed to draw the circle.

We note the circumference as c.

c = 2πr

c = πd

This depends on whether or not you know the radius (r) or the diameter (d)

Let’s calculate one manually, for example.

If r = 6 cm, then the circumference is c = 2π(6) = 12π cm, if writing in terms of π. If you prefer a numerical value, the answer rounded to the nearest tenth is 37.7 cm.

Suppose you only know the diameter? If the diameter is 8 cm, then the circumference is c = π(8) = 8π or 25.1 cm, rounded to the nearest tenth.

Step-by-step explanation:

7 0

2 years ago

What are these negative fractions converted to positive ones (I suck at math so I need an explanation): -5/6, -7 3/8, -3/11

Paraphin [41]

Answer:

multiply each by -1

-5/6 x -1 = 5/6

-7 3/8 x -1 = 7 3/8

-3/11 x -1 = 3/11

Step-by-step explanation:

6 0

2 years ago

Isabella went into a movie theater and bought 3 drinks and 10 pretzels, costing a total of $54.50. Jason went into the same movi

ruslelena [56]

The price of 1 drink is $ 4 and price of 1 pretzel is $ 4.25

Solution:

Let d" be the price of 1 drink

Let "p" be the price of 1 pretzel

Given that, Isabella went into a movie theater and bought 3 drinks and 10 pretzels, costing a total of $54.50

Therefore, we can frame a equation as,

3 x price of 1 drink + 10 x price of 1 pretzel = 54.50

$3 \times d + 10 \times p = 54.50$

3d + 10p = 54.5 ---------- eqn 1

Jason went into the same movie theater and bought 9 drinks and 5 pretzels, costing a total of $57.25

9 x price of 1 drink + 5 x price of 1 pretzel = 57.25

$9 \times d + 5 \times p = 57.25$

9d + 5p = 57.25 ---------- eqn 2

Let us solve eqn 1 and eqn 2

Multiply eqn 1 by 3

9d + 30p = 163.5 ----- eqn 3

Subtract eqn 2 from eqn 3

9d + 30p = 163.5

9d + 5p = 57.25

( - ) -----------------------

25p = 106.25

p = 4.25

Substitute p = 4.25 in eqn 1

3d + 10(4.25) = 54.5

3d + 42.5 = 54.5

3d = 54.5 - 42.5

3d = 12

d = 4

Thus price of 1 drink is $ 4 and price of 1 pretzel is $ 4.25

4 0

3 years ago

Help me. This is hard.... T^T

irina1246 [14]

Answer:

2 Sandwiches

Step-by-step explanation:

$j = - 6s + 38 \\ 26 = - 6s + 38 \\ 26 - 38 = - 6s \\ - 12 = - 6s \\ 2 = s$

3 0

3 years ago