3 years ago

Will the point (-3, 1) be on the graph of y = 2x + 4?

1 answer:

4 0

Nope! In order to solve this just plug in the points x and y values into the equation and if they're not equal then that point won't be on the line.

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Victoria bought a dress on 40% discount, and saved a massive $60. How much did the dress cost originally? How much did she pay f

kobusy [5.1K]

Answer:

Answer: Original price = $150 Amount Paid = $90

Step-by-step explanation:

First we make a proportion 60/x = 40/100. When we cross multiply and divided to get x by itself we get $150 dollars. This is the original price of the dress. Now we take $150-$60 and we get $90. This is what Victoria paid for the dress after the 40% discount.

Hope this helps! :)

8 0

2 years ago

The longer base of an isosceles trapezoid measures 23 ft. The nonparallel sides measure 9 ft, and the base angles measure 80°. F

snow_lady [41]

Check the picture.

Consider the triangle DAB, with |DA|=9 ft, |AB|=23 ft and m(DAB)=80°.

To find the length of the diagonal, |DB|, we use the cosine law:

$|DB|^{2}= |DA|^{2} + |DA|^{2} -2|DA|*|AB|*cos(DAB)$

$=9^{2}+23^{2}-2*9*2*(0.173)=81+529-6.228=603.7$

Thus, |DB|= $\sqrt{603.7}=24.6$ (ft)

Answer: 24.6 ft