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stiks02 [169]
3 years ago
12

you have 13 coins totaling $2.75 in your pocket they are all quarters and dimes. how many of each type of coin do you have?

Mathematics
1 answer:
Tanzania [10]3 years ago
4 0
Let q = quarters

Let d = dimes

q + d = 13
0.25q + 0.10d = 2.75

You have two equations and two unknowns.

Take it from here.
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2. A certain TV can be purchased from the manufacturer for $160. A certain online retailer has a standard markup of 30%, and a c
Vanyuwa [196]
Price, when purchased online:  1.30($160)
Price, when purchased at superstore:  1.40($160)

Difference in prices:  1.40($160) - 1.30($160) = 0.10($160) = $16

A higher markup brings a higher retail price.
8 0
3 years ago
A triangle has side lengths of 9 in, 13 in, and 20 in. What is the measurement of this triangle’s largest angle?
zvonat [6]
1. Given any triangle ABC with sides BC=a, AC=b and AB=c, the following are true :

      i) the larger the angle, the larger the side in front of it, and the other way around as well. (Sine Law) Let a=20 in, then the largest angle is angle A.

       ii) Given the measures of the sides of a triangle. Then the cosines of any of the angles can be found by the following formula:

       a^{2}=b ^{2}+c ^{2}-2bc(cosA)

2. 

20^{2}=9 ^{2}+13 ^{2}-2*9*13(cosA)

400=81+169-234(cosA)   150=-234(cosA)

cosA=150/-234= -0.641

3. m(A) = Arccos(-0.641)≈130°, 

4. Remark: We calculate Arccos with a scientific calculator or computer software unless it is one of the well known values, ex Arccos(0.5)=60°, Arccos(-0.5)=120° etc
4 0
3 years ago
Read 2 more answers
HELP QUICK PLS WILL GIVE BRAINLIEST
alexandr1967 [171]

Answer:

0.08(50h)

Step-by-step explanation:

0.08(50h)+50h=

8/100(50h)+50h=

0.08(50h)+50h

It's 0.08 of 50h, so

0.08(50h)

4 0
3 years ago
I NEED HELP ASAP ILL GIVE BRAINLIEST!
EleoNora [17]

Answer:

1/6

Step-by-step explanation:

4 0
1 year ago
In a certain county, the number of charter schools is 6 less than twice the number of alternative schools. We know that there ar
motikmotik
2x-6=52                               x= alternative schools
2x=58
x=29
There are 29 alternative schools in the county.
6 0
3 years ago
Read 2 more answers
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