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kolbaska11 [484]
3 years ago
7

Can someone help me

Mathematics
1 answer:
horrorfan [7]3 years ago
5 0
Im pretty sure number 15 is D
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Y+12=y-20<br> Solve for y
galina1969 [7]
Hello! I got the answer no solution, which the symbol for that is Ø
5 0
2 years ago
A motorist drives for m hours at 120km/hr and n hours at 18km/hr. Altogether Somina drives 78km in 5 hours. Find m and n.​
nikdorinn [45]

Answer:

(0.118, 4.882)

Step-by-step explanation:

If a motorist drives for m hours at 120km/hr, then the Distance of the motorist is expressed as;

​Distance = Speed * time

​da = 120m

If he drives n hours at 18km/hr;

db = 18 * n

db = 18n

Speed of the motorist altogether is expressed as;

Speed =78km/5hrs

Speed = 15.6km/hr

SInce the total distnce is 78km

120m + 18n = 78 ....1 ..... * 1

If total time is 5hrs

m + n = 5....2 ...*18

Solve simultaneously

120m + 18n = 78

18m + 18n = 90

Subtract

120m - 18m = 78-90

102m = -12

m = 0.118 hrs

m =

Since m + n = 5

n = 5 - m

= 5 - 12/102

n = 4.882

Hence (m,n) is (0.118, 4.882)

3 0
2 years ago
At a farmers market strawberries cost $1.60 per pint, blueberries cost $2.30 per pint. A shopper bought twice as many pints of s
djverab [1.8K]

<em><u>4 pints of strawberries and 2 pints of blueberries are bought</u></em>

<em><u>Solution:</u></em>

Let "a" be the pints of strawberries bought

Let "b" be the pints of blueberries cost

Cost per pint of strawberry = $ 1.60

Cost per pint of blueberry = $ 2.30

<em><u>A shopper bought twice as many pints of strawberries as pints of blueberries</u></em>

Therefore,

a = 2b --------- eqn 1

<em><u>They spent a total of $11.00. Therefore we frame a equation as:</u></em>

pints of strawberries bought x Cost per pint of strawberry + pints of blueberries cost x Cost per pint of blueberry = 11

a \times 1.60 + b \times 2.30 = 11

1.6a + 2.3b = 11 --------- eqn 2

<em><u>Substitute eqn 1 in eqn 2</u></em>

1.6(2b) + 2.3b = 11

3.2b + 2.3b = 11

5.5b = 11

Divide both sides by 11

b = 2

<em><u>Substitute b = 2 in eqn 1</u></em>

a = 2(2)

a = 4

Thus 4 pints of strawberries and 2 pints of blueberries are bought

5 0
3 years ago
What is the volume of a cylinder with a high of 9 inches in the diameter of 8 inches use 3.14 to approximate pi to calculate the
Natasha_Volkova [10]

Answer:

  452 cubic inches

Step-by-step explanation:

In terms of diameter, the volume of the cylinder is ...

  V = (π/4)d^2h

Filling in the given numbers, we get ...

  V =(3.14/4)(8 in)^2(9 in) = 452.16 in^3

The cylinder volume is about 452 cubic inches.

8 0
3 years ago
the bottom of a circular swimming pool with a diameter of 30 feet is painted blue. How many square feet are blue?
Elodia [21]
Is there any other part to that question? It would tremendously help me to understand and help you :)
5 0
3 years ago
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