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alexandr402 [8]
3 years ago
12

Mma is training for a 10-kilometer race. She wants to beat her last 10-kilometer time, which was 1 hour 10 minutes. Emma has alr

eady run for 55 minutes. Which inequality can be used to find how much longer she can run and still beat her previous time? (1 hr = 60 min)
70 greater-than 7 minus 55
70 less-than t minus 55
70 less-than-or-equal-to t + 55
70 greater-than t + 55
Mathematics
2 answers:
Vsevolod [243]3 years ago
6 0
Answer is D
Emma has to run 10 minutes longer.
The answer is 70>t+55
tatuchka [14]3 years ago
6 0

Answer: D)70 greater-than t + 55

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What is the surface of a cube with the side lenght of 9cm
marissa [1.9K]
<span>The total surface area is SA = 6 </span>× a^{2};
SA = 6 × 9^{2} = 6 × 81 = 486 cm^{2};
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3 years ago
Eli wants to combine 0.5 gallon of a 10% acid solution with some 35% acid solution to make a 15% acid solution. How much of the
emmainna [20.7K]

Answer:

<h3>              0.125 galon of 35% acid solution</h3>

Step-by-step explanation:

0.5 gallon of a 10% acid solution

10%•0.5 = 0.05 gallon of acid in that solution

x gallon of 35% acid solution

35%•x = 0.35x  gallons of acid in that solution

0.05 + 0.35x  total of gallons of acid in both solutions

(0.5+x) gallons of 15% acid solution

15%(0.5+x) = 0.15(0.5+x)  gallons of acid in that solution

the amount of gallons of acid didn't change after mixing, so:

0.05 + 0.35x = 0.15(0.5 + x)

0.05 + 0.35x = 0.075 + 0.15x

0.35x - 0.15x = 0.075  - 0.05

0.2x = 0.025

 ×5         ×5  

x = 0.125

8 0
3 years ago
Read 2 more answers
PLZ HELP ME OVER HERE!!
riadik2000 [5.3K]

Answer:

x = 5

Step-by-step explanation:

If x + 5 = 10, then x would have to be 5 because 5 + 5 = 10.

The way you would solve this would be:

x + 5 = 10

subtract 5 from both sides of the equation

x + 5 - 5 = 10 - 5

simplify:

x = 5

5 0
3 years ago
The mass of the particles that a river can transport is proportional to the sixth power of the speed of the river. A certain riv
kari74 [83]
The river flows at 2 miles per hour. This is the speed of the current, or the speed at which the water itself is moving.

The mass of the particles moving in river is proportional to the sixth power of 2, or 2^6 = 64 miles per hour. So, if x is the mass of the particle, then the speed is modeled by an inverse relationship x * 2^6 = k, for some constant k. 

For particles that are 15 times the usual mass, the speed of the river itself must increase for the particles to travel at the same speed as before. The mass of the particles is still proportional to the sixth power of the speed of the river, but the speed of the river can no longer be 2 miles per hour. It is some speed y, which we are solving for.

So, the key here is proportional. We can set up two proportions and cross multiply.

\dfrac{x}{2^6} =  \dfrac{15x}{y^6}  \\ (x)(y^6)=(2^6)(15x)

Cancelling our x's (because we don't need to solve for them), we have

y^6 = 15(2^6) = 15(64)=960

To solve for y, we must take the sixth root of both sides, or raise both sides to the one-sixth power.

\sqrt[6]{y^6} =  \sqrt[6]{960}

Using a calculator, we see that \sqrt[6]{960} = 3.14 \ miles \ per \ hour.
6 0
3 years ago
Brenda has $500 in her bank account Every week, she withdraws $40 for expeses. Without making any deposits, how many weeks can s
timofeeve [1]

Answer:

7 weeks

Step-by-step explanation:

500-200=300. 300 divided by 40 is 7.5 so 7 weeks

3 0
3 years ago
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